ci: add permissions block, fix casing and version pin, rename step

Author: mmcky

.github/workflows/rebase-translations.yml

@@ -23,13 +23,17 @@ jobs:
       startsWith(github.event.pull_request.head.ref, 'translation-sync-')
     runs-on: ubuntu-latest
 
+    permissions:
+      contents: write
+      pull-requests: write
+
     # Prevent concurrent rebases from overlapping
     concurrency:
       group: rebase-translations
       cancel-in-progress: false
 
     steps:
-      - name: Rebase conflicted translation PRs
+      - name: Rebase open translation PRs
         uses: QuantEcon/action-translation@v0.15.0
         with:
           mode: rebase