remove unnecessary trailing slash

Author: stefafafan

.github/workflows/branch-preview.yaml

@@ -78,4 +78,4 @@ jobs:
         uses: marocchino/sticky-pull-request-comment@v2
         with:
           message: |
-            Deployed ${{ github.event.pull_request.head.sha }} to ${{ steps.deployment.outputs.page_url }}/pr/${{ github.event.pull_request.number }}
+            Deployed ${{ github.event.pull_request.head.sha }} to ${{ steps.deployment.outputs.page_url }}pr/${{ github.event.pull_request.number }}