Upgrade GitHub Actions for Node 24 compatibility (#698)

## Summary

Upgrade GitHub Actions to their latest versions to ensure compatibility
with Node 24, as Node 20 will reach end-of-life in April 2026.

## Changes

| Action | Old Version(s) | New Version | Release | Files |
|--------|---------------|-------------|---------|-------|
| `actions/checkout` |
[`v4`](https://github.com/actions/checkout/releases/tag/v4) |
[`v6`](https://github.com/actions/checkout/releases/tag/v6) |
[Release](https://github.com/actions/checkout/releases/tag/v6) |
_example_tests_runner.yml, code_quality.yml, example_tests.yml,
gpu_tests.yml, pages.yml, unit_tests.yml |
| `actions/setup-python` |
[`v5`](https://github.com/actions/setup-python/releases/tag/v5) |
[`v6`](https://github.com/actions/setup-python/releases/tag/v6) |
[Release](https://github.com/actions/setup-python/releases/tag/v6) |
code_quality.yml, pages.yml, unit_tests.yml |

## Context

Per [GitHub's
announcement](https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/),
Node 20 is being deprecated and runners will begin using Node 24 by
default starting March 4th, 2026.

### Why this matters

- **Node 20 EOL**: April 2026
- **Node 24 default**: March 4th, 2026
- **Action**: Update to latest action versions that support Node 24

### Security Note

Actions that were previously pinned to commit SHAs remain pinned to SHAs
(updated to the latest release SHA) to maintain the security benefits of
immutable references.

### Testing

These changes only affect CI/CD workflow configurations and should not
impact application functionality. The workflows should be tested by
running them on a branch before merging.

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Author: salmanmkc

.github/workflows/_example_tests_runner.yml

@@ -38,7 +38,7 @@ jobs:
         PIP_CONSTRAINT: "" # Disable pip constraint for upgrading packages
         HF_TOKEN: ${{ secrets.HF_TOKEN }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: nv-gha-runners/setup-proxy-cache@main
       - name: Setup environment variables
         run: |

.github/workflows/code_quality.yml

@@ -17,8 +17,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Secret Scanning

.github/workflows/example_tests.yml

@@ -20,7 +20,7 @@ jobs:
     outputs:
       any_changed: ${{ steps.changed-tests.outputs.any_changed }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - id: get-pr-info

.github/workflows/gpu_tests.yml

@@ -21,7 +21,7 @@ jobs:
     outputs:
       any_changed: ${{ steps.changed-tests.outputs.any_changed }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - id: get-pr-info
@@ -68,7 +68,7 @@ jobs:
         PIP_CONSTRAINT: "" # Disable pip constraint for upgrading packages
         HF_TOKEN: ${{ secrets.HF_TOKEN }}
     steps: &gpu_steps
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: nv-gha-runners/setup-proxy-cache@main
       - name: Setup environment variables
         run: |

.github/workflows/pages.yml

@@ -25,8 +25,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Build docs

.github/workflows/unit_tests.yml

@@ -34,8 +34,8 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Run unit tests
@@ -52,8 +52,8 @@ jobs:
     runs-on: windows-latest
     timeout-minutes: 30
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Run unit tests (without coverage)
@@ -67,8 +67,8 @@ jobs:
       matrix:
         py: [10, 11]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.${{ matrix.py }}"
       - name: Run unit tests
@@ -82,8 +82,8 @@ jobs:
       matrix:
         torch: [26, 27, 28]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Run unit tests
@@ -97,8 +97,8 @@ jobs:
       matrix:
         tf: [min]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Run unit tests
@@ -112,8 +112,8 @@ jobs:
       matrix:
         test-env: [onnx, torch]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - name: Run unit tests