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/commitlint.yaml

@@ -14,7 +14,8 @@ jobs:
     if: ${{ github.event.pull_request.user.login != 'dependabot[bot]' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      # yamllint disable-line rule:line-length
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332  # v4.1.7
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: commitlint