GH Actions/Update docs workflow: fix permissions

Author: jrfnl

.github/workflows/update-docs.yml

@@ -25,6 +25,12 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
 env:
   DEFAULT_BRANCH: 'stable'