github action updates: bump actions/github-script from 6 to 8 (#26)

Bumps [actions/github-script](https://github.com/actions/github-script) from 6 to 8.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v6...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dependabotautomerge.yml

@@ -19,7 +19,7 @@ jobs:
     if: github.actor == 'dependabot[bot]'
     steps:
       - name: automerge
-        uses: actions/github-script@v8.0.0
+        uses: actions/github-script@v8
         with:
           script: |
             github.rest.pulls.createReview({

.github/workflows/rebase-dependabot.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Rebase Dependabot open PRs
-        uses: actions/github-script@v6
+        uses: actions/github-script@v8
         with:
           script: |
             const owner = context.repo.owner;