Revert "temp: Update self refence of update-catalog to testing branch"

This reverts commit e86ab22.

Sean's commit re-pointed starter.yml's call-update-catalog-workflow
job at update-catalog.yml@port-update-catalog-to-v5 so an integration
repo could test the new flow end-to-end through this PR branch
without anything having to land on v5 first. That was the right call
for testing, but leaving the temp commit in would mean post-merge
v5's starter.yml would either point at a deleted feature branch
(if GitHub auto-deletes the branch on merge) or at a stale,
no-longer-canonical ref otherwise. Either way it breaks the
self-reference v5 needs once update-catalog lands.

After this revert the PR's net diff vs v5 is just the update-catalog
workflow replacement — starter.yml stays at @v5.

If we need to re-enable the end-to-end test wiring, just cherry-pick
e86ab22 back onto a test branch, push, point the integration repo
at starter.yml@<test-branch>, then drop the cherry-pick before merge.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bhillkeyfactor

.github/workflows/starter.yml

@@ -138,7 +138,7 @@ jobs:
   call-update-catalog-workflow:
     needs: call-assign-from-json-workflow
     if: needs.call-assign-from-json-workflow.outputs.update_catalog  == 'true' && github.ref_name == 'main' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch')
-    uses: Keyfactor/actions/.github/workflows/update-catalog.yml@port-update-catalog-to-v5
+    uses: Keyfactor/actions/.github/workflows/update-catalog.yml@v5
     secrets:
       token: ${{ secrets.token }}