build: update timezone-update.yml

Signed-off-by: sashashura <93376818+sashashura@users.noreply.github.com>

PR-URL: nodejs/node#44717
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Tierney Cyren <hello@bnb.im>
Reviewed-By: Rich Trott <rtrott@gmail.com>

.github/workflows/timezone-update.yml

@@ -6,8 +6,15 @@ on:
 
   workflow_dispatch:
 
+permissions:
+  contents: read
+
 jobs:
   timezone_update:
+    permissions:
+      contents: write  # to push local changes (gr2m/create-or-update-pull-request-action)
+      pull-requests: write  # to create a PR (gr2m/create-or-update-pull-request-action)
+
     if: github.repository == 'nodejs/node'
     runs-on: ubuntu-latest