[release/2.14] Pin validation to release/2.14 and bump CURRENT_CANDIDATE_VERSION

Release-only follow-up to the 2.14 branch cut (79a17ec), porting the
equivalents of #8171 / #8172 / #8216 from release/2.13.

## 1. `CURRENT_CANDIDATE_VERSION` -> 2.14.0

The branch cut moved `CURRENT_NIGHTLY_VERSION` to 2.14.0 but left
`CURRENT_CANDIDATE_VERSION` at 2.13.0. For the test channel
`initialize_globals()` sets `CURRENT_VERSION = CURRENT_CANDIDATE_VERSION`,
which the generated matrix surfaces as `stable_version` and `smoke_test.py`
then enforces. Since the test channel now serves the 2.14.0 release
candidate, validation fails with:

```
RuntimeError: Torch version mismatch, expected 2.13.0 for channel test
```

Verified with `generate_binary_build_matrix.py --channel test`:
`stable_version` goes 2.13.0 -> 2.14.0. `CURRENT_STABLE_VERSION` stays at
2.13.0 (the current GA release); it moves separately when 2.14 goes live.

## 2. `pytorch/pytorch` checkouts -> `ref: release/2.14`

The validation jobs check out `repository: "pytorch/pytorch"` with
`ref: main`, so release validation ran against main's `.ci` /
`test/smoke_test` sources instead of the release branch. Pinned in all
seven call sites across `validate-{linux,windows,macos-arm64,aarch64-linux}-binaries.yml`
and `validate-docker-images.yml`, matching release/2.13's state.

## 3. Explicit `test-infra-ref: release/2.14` in matrix generation

Belt-and-braces: the branch cut already rewrote the `test-infra-ref`
default in `generate_binary_build_matrix.yml` to `release/2.14`, so this is
not a live bug on 2.14 (it was on 2.13, where the default stayed `main`).
Passing it explicitly keeps the matrix pinned to the release branch even if
that default is ever re-synced from main.

## 4. Revert a branch-cut sed artifact

The cut rewrote a comment referring to the *Poetry* project's own branch,
`poetry@main` -> `poetry@release/2.14`, which is meaningless. Restored.

Authored with the assistance of Claude Code.

Author: atalman

.github/workflows/validate-aarch64-linux-binaries.yml

@@ -96,6 +96,7 @@ jobs:
       package-type: wheel
       os: linux-aarch64
       channel: ${{ inputs.channel }}
+      test-infra-ref: release/2.14
       with-cuda: enable
       with-cpu: enable
       use-only-dl-pytorch-org: ${{ inputs.use-only-dl-pytorch-org }}
@@ -110,7 +111,7 @@ jobs:
     with:
       runner: ${{ matrix.validation_runner }}
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: ${{ matrix.build_name }}
       docker-image: ${{ matrix.container_image }}
       binary-matrix: ${{ toJSON(matrix) }}

.github/workflows/validate-docker-images.yml

@@ -59,7 +59,7 @@ jobs:
     with:
       runner: ${{ matrix.validation_runner }}
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: cuda${{ matrix.cuda }}-cudnn${{ matrix.cudnn_version }}-${{ matrix.image_type }}
       binary-matrix: ${{ toJSON(matrix) }}
       docker-image: ${{matrix.docker}}

.github/workflows/validate-linux-binaries.yml

@@ -106,6 +106,7 @@ jobs:
       package-type: wheel,libtorch
       os: linux
       channel: ${{ inputs.channel }}
+      test-infra-ref: release/2.14
       use-only-dl-pytorch-org: ${{ inputs.use-only-dl-pytorch-org }}
       with-xpu: enable
 
@@ -119,7 +120,7 @@ jobs:
     with:
       runner: ${{ matrix.validation_runner }}
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: ${{ matrix.build_name }}
       # ROCm validates on the regular almalinux image (like CUDA) to confirm
       # the wheels are self-contained. Only XPU still needs its own container.
@@ -145,7 +146,7 @@ jobs:
 
         # Validate binaries. Poetry-based validation now lives in the
         # standalone linux-poetry job below so Poetry's own ecosystem
-        # churn (it was previously installed from poetry@release/2.14) cannot
+        # churn (it was previously installed from poetry@main) cannot
         # flake the binary matrix.
         source ../../test-infra/.github/scripts/validate_binaries.sh
 
@@ -156,7 +157,7 @@ jobs:
     with:
       runner: "linux.g5.4xlarge.nvidia.gpu"
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: "poetry-test"
       docker-image: 'pytorch/almalinux-builder:cpu-main'
       docker-build-dir: "skip-docker-build"
@@ -185,7 +186,7 @@ jobs:
     with:
       runner: "linux.g5.4xlarge.nvidia.gpu"
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: "amazon-linux-2023-test"
       docker-image: 'almalinux/9-base'
       docker-build-dir: "skip-docker-build"

.github/workflows/validate-macos-arm64-binaries.yml

@@ -96,6 +96,7 @@ jobs:
       package-type: wheel,libtorch #  We stopped producing conda nightlies
       os: macos-arm64
       channel: ${{ inputs.channel }}
+      test-infra-ref: release/2.14
       use-only-dl-pytorch-org: ${{ inputs.use-only-dl-pytorch-org }}
 
   macos-arm64:
@@ -108,7 +109,7 @@ jobs:
     with:
       runner: ${{ matrix.validation_runner }}
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: ${{ matrix.build_name }}
       binary-matrix: ${{ toJSON(matrix) }}
       script: |

.github/workflows/validate-windows-binaries.yml

@@ -96,6 +96,7 @@ jobs:
       package-type: wheel,libtorch #  We stopped producing conda nightlies
       os: windows
       channel: ${{ inputs.channel }}
+      test-infra-ref: release/2.14
       use-only-dl-pytorch-org: ${{ inputs.use-only-dl-pytorch-org }}
       with-xpu: enable
 
@@ -109,7 +110,7 @@ jobs:
     with:
       runner: ${{ matrix.package_type == 'libtorch' && 'windows.4xlarge' || matrix.validation_runner }}
       repository: "pytorch/pytorch"
-      ref: main
+      ref: release/2.14
       job-name: ${{ matrix.build_name }}
       binary-matrix: ${{ toJSON(matrix) }}
       timeout: 60

tools/scripts/generate_binary_build_matrix.py

@@ -99,7 +99,7 @@
 
 
 CURRENT_NIGHTLY_VERSION = "2.14.0"
-CURRENT_CANDIDATE_VERSION = "2.13.0"
+CURRENT_CANDIDATE_VERSION = "2.14.0"
 CURRENT_STABLE_VERSION = "2.13.0"
 CURRENT_VERSION = CURRENT_STABLE_VERSION