ci(label): Fix workflow (#19)

Signed-off-by: Dave Henderson <dhenderson@gmail.com>

.github/workflows/label.yml

@@ -1,10 +1,20 @@
 name: Labeler
-on: [pull_request]
+on:
+  pull_request_target:
+    types: [ opened ]
+    branches: [ master ]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 
 jobs:
   label:
+    permissions:
+      contents: read
+      pull-requests: write
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/labeler@v2
+    - uses: actions/labeler@v5
       with:
         repo-token: "${{ secrets.GITHUB_TOKEN }}"