[GHA] Bump actions/github-script from 7 to 8

Bumps [actions/github-script](https://github.com/actions/github-script) from 7 to 8.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v7...v8)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/pr_checks.yml

@@ -30,7 +30,7 @@ jobs:
           pip install GitPython==3.1.42
           git fetch origin ${{ github.event.pull_request.head.sha }}
           python .ci/scripts/pr_labels.py "origin/${{ github.base_ref }}" "${{ github.event.pull_request.head.sha }}" >> "$GITHUB_ENV"
-      - uses: "actions/github-script@v7"
+      - uses: "actions/github-script@v8"
         name: "Apply PR Labels"
         with:
           script: |

.github/workflows/release_branch.yml

@@ -33,7 +33,7 @@ jobs:
           branch: "bump_version"
           delete-branch: true
       - name: "Add Backport Label for new Branch"
-        uses: "actions/github-script@v7"
+        uses: "actions/github-script@v8"
         with:
           script: |
             const { NEW_BRANCH } = process.env;