Update actions/github-script action to v8

Author: renovate[bot]

.github/workflows/build-and-push.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Compute Tag
-        uses: actions/github-script@v6
+        uses: actions/github-script@v8
         id: compute-tag
         with:
           result-encoding: string