Grant PR write access to token in label and assigner workflows

Author: huydhn

.github/workflows/assigner.yml

@@ -16,6 +16,9 @@ on:
 
 jobs:
   assign:
+    permissions:
+      contents: read
+      pull-requests: write
     runs-on: ubuntu-latest
     steps:
     - name: Checkout

.github/workflows/label.yml

@@ -10,11 +10,12 @@ on: [pull_request_target]
 
 jobs:
   label:
-
+    permissions:
+      contents: read
+      pull-requests: write
     runs-on: ubuntu-latest
-
     steps:
-    - uses: actions/labeler@v2
+    - uses: actions/labeler@v4
       with:
         repo-token: "${{ secrets.GITHUB_TOKEN }}"
         configuration-path: .github/pr-labels.yml