chore: DEVPLAT-7373 fix Node.js 20 deprecated GitHub Actions

Author: kristianmills

.github/workflows/test-on-pull-request.yml

@@ -8,6 +8,8 @@ jobs:
     concurrency: ${{ github.ref }}
     steps:
       - uses: actions/checkout@v6
+        with:
+          ref: ${{ github.head_ref }}
       - uses: pnpm/action-setup@v5
         with:
           version: 7.6.0