add (redundant) write permission to release workflow (#6575)

Signed-off-by: Chris O'Haver <cohaver@infoblox.com>

.github/workflows/release.yml

@@ -11,6 +11,8 @@ jobs:
   release:
     name: Release
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
       - name: Check out code
         uses: actions/checkout@v4