Fix run pre-script for python 3.13t installation process

[atalman]

Linux failure : https://github.com/pytorch/vision/actions/runs/22097230572/job/63857381286

Could not solve for environment specs
The following packages are incompatible
├─ libwebp =* * is installable with the potential options
│  ├─ libwebp [1.0.0|1.0.1] would require
│  │  └─ libtiff >=4.0.9,<4.7.0 * with the potential options
│  │     ├─ libtiff [4.0.10|4.0.9|4.1.0|4.5.0|4.5.1] would require
│  │     │  └─ xz >=5.2.4,<6.0a0 *, which can be installed;
│  │     ├─ libtiff 4.0.9 would require
│  │     │  └─ xz >=5.2.3,<6.0a0 *, which can be installed;
│  │     ├─ libtiff [4.1.0|4.2.0|4.4.0] would require
│  │     │  └─ xz >=5.2.5,<6.0a0 *, which can be installed;
│  │     ├─ libtiff 4.4.0 would require
│  │     │  └─ xz >=5.2.6,<6.0a0 *, which can be installed;
│  │     ├─ libtiff 4.5.0 would require
│  │     │  └─ xz >=5.2.8,<6.0a0 *, which can be installed;
│  │     └─ libtiff 4.5.1 would require
│  │        └─ xz >=5.2.10,<6.0a0 *, which can be installed;
│  ├─ libwebp [1.1.0|1.2.0|1.2.2|1.2.4|1.3.2] would require
│  │  └─ libtiff >=4.1.0,<4.7.0 *, which can be installed (as previously explained);
│  └─ libwebp [1.3.2|1.6.0] would require
│     └─ libtiff [>=4.7.0,<5.0a0 *|>=4.7.1,<5.0a0 *], which requires
│        └─ xz >=5.6.4,<6.0a0 *, which can be installed;
├─ pin on python 3.13.* =* * is installable and it requires
│  └─ python =3.13 *, which can be installed;
├─ python-freethreading =* * is installable with the potential options
│  ├─ python-freethreading 3.13.12 would require
│  │  └─ python_abi =* *_cp313t, which requires
│  │     └─ python =3.13 *_cp313t, which can be installed;
│  ├─ python-freethreading 3.14.0 would require
│  │  └─ python =3.14.0 *, which conflicts with any installable versions previously reported;
│  ├─ python-freethreading 3.14.1 would require
│  │  └─ python =3.14.1 *, which conflicts with any installable versions previously reported;
│  └─ python-freethreading 3.14.2 would require
│     └─ python =3.14.2 *, which conflicts with any installable versions previously reported;
└─ wheel =0.37 * is not installable because it requires
   └─ python [!=3.0,(!=3.1,(!=3.2,(!=3.3,!=3.4))) *|=* *] but there are no viable options
      ├─ python [2.7.13|2.7.14|...|3.9.7] conflicts with any installable versions previously reported;
      ├─ python 3.14.0 conflicts with any installable versions previously reported;
      ├─ python 3.14.1 conflicts with any installable versions previously reported;
      ├─ python 3.14.2 conflicts with any installable versions previously reported;
      └─ python 3.13.12 would require
         └─ liblzma >=5.8.2,<6.0a0 *, which requires
            └─ xz =5.8.2 *, which conflicts with any installable versions previously reported

MacOS failure: https://github.com/pytorch/vision/actions/runs/22097230534/job/63857777891

LibMambaUnsatisfiableError: Encountered problems while solving:
  - package python-3.13.12-h76e3b2d_0_cp313t requires liblzma >=5.8.2,<6.0a0, but none of the providers can be installed

Could not solve for environment specs
The following packages are incompatible
├─ libwebp =* * is installable with the potential options
│  ├─ libwebp [1.2.0|1.2.2|1.2.4|1.3.2] would require
│  │  └─ libtiff >=4.2.0,<4.7.0 * with the potential options
│  │     ├─ libtiff [4.2.0|4.4.0] would require
│  │     │  └─ xz >=5.2.5,<6.0a0 *, which can be installed;
│  │     ├─ libtiff 4.4.0 would require
│  │     │  └─ xz >=5.2.6,<6.0a0 *, which can be installed;
│  │     ├─ libtiff 4.5.0 would require
│  │     │  └─ xz >=5.2.8,<6.0a0 *, which can be installed;
│  │     ├─ libtiff [4.5.0|4.5.1] would require
│  │     │  └─ xz >=5.2.4,<6.0a0 *, which can be installed;
│  │     └─ libtiff 4.5.1 would require
│  │        └─ xz >=5.2.10,<6.0a0 *, which can be installed;
│  └─ libwebp [1.3.2|1.6.0] would require
│     └─ libtiff [>=4.7.0,<5.0a0 *|>=4.7.1,<5.0a0 *], which requires
│        └─ xz >=5.6.4,<6.0a0 *, which can be installed;
├─ pin on python =3.13 * is installable and it requires
│  └─ python =3.13 *, which can be installed;
├─ python-freethreading =* * is installable with the potential options
│  ├─ python-freethreading 3.13.12 would require
│  │  └─ python_abi =* *_cp313t, which requires
│  │     └─ python =3.13 *_cp313t, which can be installed;
│  ├─ python-freethreading 3.14.0 would require
│  │  └─ python =3.14.0 *, which conflicts with any installable versions previously reported;
│  ├─ python-freethreading 3.14.1 would require
│  │  └─ python =3.14.1 *, which conflicts with any installable versions previously reported;
│  └─ python-freethreading 3.14.2 would require
│     └─ python =3.14.2 *, which conflicts with any installable versions previously reported;
└─ wheel =0.37 * is not installable because it requires
   └─ python [!=3.0,(!=3.1,(!=3.2,(!=3.3,!=3.4))) *|=* *] but there are no viable options
      ├─ python [3.10.0|3.10.10|...|3.9.7] conflicts with any installable versions previously reported;
      ├─ python 3.14.0 conflicts with any installable versions previously reported;
      ├─ python 3.14.1 conflicts with any installable versions previously reported;
      ├─ python 3.14.2 conflicts with any installable versions previously reported;
      └─ python 3.13.12 would require
         └─ liblzma >=5.8.2,<6.0a0 *, which requires
            └─ xz =5.8.2 *, which conflicts with any installable versions previously reported.


...
PackagesNotFoundError: The following packages are missing from the target environment:
  - libjpeg-turbo
  - libjpeg

Failure started to happen after merging pytorch/test-infra#7753 - conda version was unpinned

Related PR for 3.13t we use environment created with conda-forge: pytorch/test-infra#7769
And looks like with conda version 25.3.0 has issues resolving the install for libwebp and libpng I believe this is related to the fact that 3.13t builds use conda-forge environment

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/vision/9391

• 📄 Preview Python docs built from this PR

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✅ You can merge normally! (1 Unrelated Failure)

As of commit 206498a with merge base 0f6d91d ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Tests / unittests-windows (3.14, windows.4xlarge, cpu) / windows-job (gh) (trunk failure)
  Process completed with exit code 1.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[NicolasHug]

Thanks for the PR @atalman . Is this safe? We have avoided mixing up conda channels due to frequent incompatibilities issues.

[atalman]

HI @NicolasHug conda without conda-forge does not support 3.13t : https://anaconda.org/channels/main/packages/python-freethreading/overview -> there is no version for 3.13t

we already do use conda-forge when creating environment here:
https://github.com/pytorch/test-infra/blob/main/.github/actions/setup-binary-builds/action.yml#L143

[atalman]

not required anymore