[FORGEJO] allow pull requests to cascade (#97)

Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/97
Reviewed-by: dachary <dachary@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-setup-forgejo.yml

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: MIT
 on:
-  pull_request:
+  pull_request_target:
     types:
       - opened
       - synchronize