Don't run label workflow on edited event types

To avoid rate limit.

Author: marcphilipp

.github/workflows/label-pull-request.yml

@@ -1,8 +1,7 @@
 name: Copy labels from linked issues to PR
 
 on:
-  pull_request_target:
-    types: [opened, reopened, edited, synchronize] # zizmor: ignore[dangerous-triggers]
+  pull_request_target: # zizmor: ignore[dangerous-triggers]
 
 permissions: {}