update release plan workflow

this allows for label events to work from forks

.github/workflows/plan-release.yml

@@ -4,9 +4,10 @@ on:
     branches:
       - main
       - master
-  pull_request:
+  pull_request_target: # This workflow has permissions on the repo, do NOT run code from PRs in this workflow. See https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
     types:
       - labeled
+      - unlabeled
 
 concurrency:
   group: plan-release # only the latest one of these should ever be running
@@ -41,7 +42,7 @@ jobs:
       explanation: ${{ steps.explanation.outputs.text }}
     # only run on push event if plan wasn't updated (don't create a release plan when we're releasing)
     # only run on labeled event if the PR has already been merged
-    if: (github.event_name == 'push' && needs.check-plan.outputs.command != 'release') || (github.event_name == 'pull_request' && github.event.pull_request.merged == true)
+    if: (github.event_name == 'push' && needs.check-plan.outputs.command != 'release') || (github.event_name == 'pull_request_target' && github.event.pull_request.merged == true)
 
     steps:
       - uses: actions/checkout@v4