Alpha builds workflow: fix a typo

Author: michaelklishin

.github/workflows/alpha-build.yaml

@@ -26,7 +26,7 @@ jobs:
             -H "Accept: application/vnd.github+json" \
             -H "Authorization: Bearer ${{ secrets.RABBITMQCI_BOT_TOKEN }}" \
             -H "X-GitHub-Api-Version: 2022-11-28" \
-            https://api.github.com/repos/rabbitmq/${{ env.DEV_WORKFLOW_REPOSITORY }}/dispatches \
+            https://api.github.com/repos/${{ env.DEV_WORKFLOW_REPOSITORY }}/dispatches \
             -d '{ \
            "event_type": "new_4.1.x_alpha", \
            "client_payload": { \