deps: update actions/github-script action to v7 (#6303)

Author: renovate-bot

.github/workflows/approve-readme.yaml

@@ -21,7 +21,7 @@ jobs:
  runs-on: ubuntu-latest
  if: github.repository_owner == 'googleapis' && github.head_ref == 'autosynth-readme'
  steps:
- - uses: actions/github-script@v6
+ - uses: actions/github-script@v7
  with:
  github-token: ${{secrets.YOSHI_APPROVER_TOKEN}}
  script: |