Remove labeled event (viamrobotics#127)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: njooma

.github/workflows/pullrequest.yml

@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
   pull_request:
     branches: [ 'main' ]
-    types: [opened, synchronize, reopened, labeled]
+    types: [opened, synchronize, reopened]
   push:
     branches: [ '!main' ]