ci: fix labeler workflow

Author: sacha-c

.github/workflows/conventional-label.yaml

@@ -1,5 +1,8 @@
+# Warning, do not check out untrusted code with
+# the pull_request_target event.
 on:
-  pull_request:
+  pull_request_target:
+    types: [ opened, edited ]
 name: conventional-release-labels
 jobs:
   label: