This workflow doesn't require for PR.

.github/workflows/update-catch.yaml

@@ -1,6 +1,5 @@
 name: Update Catch
 on:
-  pull_request:
   workflow_dispatch:
   schedule:
     - cron:  '0 10 1/16 * *'
@@ -9,8 +8,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-        with:
-          ref: ${{ github.head_ref }}
       - name: Get Latest Catch Tagged Release
         id: catch-header
         run: |
@@ -45,9 +42,7 @@ jobs:
           commit-message: Upgrade Catch to ${{ steps.catch-header.outputs.release_tag }}
           title: Upgrade Catch to ${{ steps.catch-header.outputs.release_tag }}
           body: |
-            Updates [catchorg/Catch2][1] to ${{ steps.catch-header.outputs.release_tag }}.
-            Auto-generated by [create-pull-request][2]
-            [1]: https://github.com/catchorg/Catch2
-            [2]: https://github.com/peter-evans/create-pull-request
-          labels: update headers deps, automated pr
+            Updates (catchorg/Catch2)[https://github.com/catchorg/Catch2] to ${{ steps.catch-header.outputs.release_tag }}.
+            Auto-generated by (create-pull-request)[https://github.com/peter-evans/create-pull-request]
+          labels: update dependencies, automated PR
           branch: catch-header-updates-${{ steps.catch-header.outputs.release_tag }}