Fix the bundle audit workflow

The Bundler Audit GitHub Action is currently not working as intended. We're getting an error when running it. 

There's a PR to fix the issue on the repository, but we can use the thoughtbot fork in the meantime.

.github/workflows/bundle-audit.yml

@@ -8,6 +8,6 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: 'Bundler Audit'
-        uses: andrewmcodes/bundler-audit-action@main
+        uses: thoughtbot/bundler-audit-action@main
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}