chore: wait 4 times longer for the forgejo cascade pull request to complete (#988)

If the CI is busy, it may take more than one hour, for instance because the workflow is waiting while others are running.

---

Note to reviewers: this input is not yet implemented, the next version of the cascading-pr action will have it (see [the pr](https://code.forgejo.org/actions/cascading-pr/pulls/40)). In the meantime it will be ignored.

<!--start release-notes-assistant-->
<!--URL:https://code.forgejo.org/forgejo/runner-->
- other
  - [PR](https://code.forgejo.org/forgejo/runner/pulls/988): <!--number 988 --><!--line 0 --><!--description Y2hvcmU6IHdhaXQgNCB0aW1lcyBsb25nZXIgZm9yIHRoZSBmb3JnZWpvIGNhc2NhZGUgcHVsbCByZXF1ZXN0IHRvIGNvbXBsZXRl-->chore: wait 4 times longer for the forgejo cascade pull request to complete<!--description-->
<!--end release-notes-assistant-->

Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/988
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.code.forgejo.org>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

.forgejo/workflows/cascade-forgejo.yml

@@ -106,4 +106,5 @@ jobs:
           close: true
           verbose: ${{ vars.VERBOSE == 'yes' }}
           debug: ${{ vars.DEBUG == 'yes' }}
+          wait-iteration: 120
           update: .forgejo/cascading-forgejo