Merge pull request thunderbird#9849 from rafaeltonholo/ci/change-dependency-guard-update-to-pull-request-target

ci(dependency-guard-update): use `pull_request_target` instead of `pull_request`

Author: rafaeltonholo

.github/workflows/dependabot-dependency-guard-update.yml

@@ -1,7 +1,7 @@
 name: dependabot PR - Update dependency guard
 
 on:
-  pull_request:
+  pull_request_target:
     types:
       - opened
       - synchronize