🔧 Update permissions for code-coverage commenting

Author: jemrobinson

.github/workflows/test_code.yaml

@@ -11,6 +11,14 @@ jobs:
   run_tests:
     runs-on: ubuntu-latest
     name: Run Python tests
+    permissions:
+      # Gives the action the necessary permissions for publishing new
+      # comments in pull requests.
+      pull-requests: write
+      # Gives the action the necessary permissions for pushing data to the
+      # python-coverage-comment-action branch, and for editing existing
+      # comments (to avoid publishing multiple comments in the same PR)
+      contents: write
     strategy:
       fail-fast: false
       matrix: