[Windows CI] Pin openssl=3.5.6 in setup-binary-builds to fix cert-store ASN.1 failure (#8165)

## Summary

Windows wheel-build smoke tests started failing at **import /
SSL-context creation time** with:

```
ssl.SSLError: [ASN1: NOT_ENOUGH_DATA] not enough data (_ssl.c:4040)
```

in `ssl.create_default_context() -> load_default_certs ->
_load_windows_store_certs`.

Example: torchvision "Build Windows Wheels" smoke test —
https://github.com/pytorch/vision/actions/runs/27246136085/job/80460480702
— crashes in `smoke_test_torchvision_resnet50_classify`.

## Root cause

The build/test conda env in `setup-binary-builds` creates `openssl` as
an **unpinned** transitive dep. conda silently pulled the newly released
**openssl 3.5.7** (the job log shows `openssl 3.5.6 --> 3.5.7`), which
tightened/regressed ASN.1 parsing and now hard-rejects a malformed
certificate in the Windows machine cert store that 3.5.6 tolerated.

This is the same failure and fix as **pytorch/pytorch#186846**, which
pinned `openssl=3.5.6` in `.github/actions/setup-win/action.yml`.
test-infra's wheel-build path uses a different conda env
(`setup-binary-builds`), so it needs the same pin.

## Fix

Pin `openssl=3.5.6` directly in the `conda create` for the build/test
environment in `.github/actions/setup-binary-builds/action.yml` (same
approach as the PyTorch PR). Applied unconditionally for all platforms
for simplicity — only Windows hits the cert-store path, and openssl
3.5.6 is available for Linux/macOS too.

## Test plan

Windows wheel-build smoke tests (e.g. torchvision) should get openssl
3.5.6 and run `smoke_test.py` without the ASN.1 error.

Author: atalman

.github/actions/setup-binary-builds/action.yml

@@ -139,6 +139,10 @@ runs:
               ;;
           esac
 
+          # Pin openssl=3.5.6: openssl 3.5.7 regressed ASN.1 parsing and rejects a
+          # malformed cert in the Windows machine cert store, breaking
+          # ssl.create_default_context() with "[ASN1: NOT_ENOUGH_DATA]" at smoke-test
+          # time. See https://github.com/pytorch/pytorch/pull/186846
           conda create \
               --yes --quiet \
               --prefix "${CONDA_ENV}" \
@@ -149,6 +153,7 @@ runs:
               libpng \
               pkg-config=0.29 \
               wheel=0.37  \
+              "openssl=3.5.6" \
               ${CONDA_EXTRA_PARAM}
 
           echo "CONDA_ENV=${CONDA_ENV}" >> "${GITHUB_ENV}"