Build/Test Tools: Correct upgrade testing workflow name.

The reusable upgrade testing workflow was renamed in [58165], but the event `paths` filters were not updated accordingly.

See #62221.

git-svn-id: https://develop.svn.wordpress.org/trunk@59403 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/upgrade-testing.yml

@@ -7,12 +7,12 @@ on:
     # Always test the workflow after it's updated.
     paths:
       - '.github/workflows/upgrade-testing.yml'
-      - '.github/workflows/upgrade-testing-run.yml'
+      - '.github/workflows/reusable-upgrade-testing.yml'
   pull_request:
     # Always test the workflow when changes are suggested.
     paths:
       - '.github/workflows/upgrade-testing.yml'
-      - '.github/workflows/upgrade-testing-run.yml'
+      - '.github/workflows/reusable-upgrade-testing.yml'
   workflow_dispatch:
     inputs:
       new-version: