temp: trigger requirements upgrade workflow

.github/workflows/upgrade-python-requirements.yml

@@ -9,12 +9,13 @@ on:
         description: "Target branch against which to create requirements PR"
         required: true
         default: 'master'
+  pull_request:
 
 jobs:
   call-upgrade-python-requirements-workflow:
     uses: openedx/.github/.github/workflows/upgrade-python-requirements.yml@master
     with:
-      branch: ${{ github.event.inputs.branch || 'master' }}
+      branch: 'python312-upgrade'
       # optional parameters below; fill in if you'd like github or email notifications
       # user_reviewers: ""
       # team_reviewers: ""