ci: bump actions/github-script from 7 to 8 (#59)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/upstream_formula_update.yml

@@ -54,7 +54,7 @@ jobs:
           git push origin "HEAD:refs/heads/${branch}"
 
       - name: Create PR
-        uses: actions/github-script@v7
+        uses: actions/github-script@v8
         id: create-pr
         with:
           github-token: ${{ secrets.GIT_PAT }}