Add contents=write for GH pages push

https://github.com/JamesIves/github-pages-deploy-action?tab=readme-ov-file#getting-started-airplane

Author: scottzach1

.github/workflows/testing.yml

@@ -8,6 +8,9 @@ on:
     branches:
       - main
 
+permissions:
+  contents: write
+
 jobs:
   ruff:
     runs-on: ubuntu-latest