chore(deps): update actions/github-script action to v8 (#44)

Co-authored-by: Averi Kitsch <akitsch@google.com>

Author: renovate-bot

.github/workflows/mirror-changelog.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Add Toolbox Release Notes to PR Body
-        uses: actions/github-script@v6
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8
         env:
           REQUIRED_KEYWORDS: 'postgres'
         with: