Add required permissions for releasing gem

Author: satoryu

.github/workflows/release.yml

@@ -11,6 +11,10 @@ jobs:
 
     if: startsWith(github.ref, 'refs/tags/') # Run only when tagged like v1.0.1
 
+    permissions:
+      contents: write
+      id-token: write
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4