chore(deps): update actions/github-script action to v8

Author: renovate[bot]

.github/workflows/automerge.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
       - name: Squash and merge
-        uses: actions/github-script@v5
+        uses: actions/github-script@v8
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |

.github/workflows/optimize-and-merge.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Squash and merge
         if: |
           contains(github.event.pull_request.body, 'Automerge**: Enabled')
-        uses: actions/github-script@v5
+        uses: actions/github-script@v8
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |