ci: Harden GitHub Actions

Update GitHub actions to use full length commit ids for
third-party actions to reduce security risk in case of vulnerabilities.

Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>
Co-authored-by: Nikhil-Ladha <nikhilladha1999@gmail.com>

.github/workflows/stale.yaml

@@ -18,7 +18,8 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository == 'ceph/ceph-csi'
     steps:
-      - uses: actions/stale@v9
+      # yamllint disable-line rule:line-length
+      - uses: actions/stale@28ca1036281a5e5922ead5184a1bbf96e5fc984e  # v9.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           days-before-issue-stale: 30