ci: grant test job write permissions for coverage reporting

coverage-action with publish: true needs contents: write to push to
_xml_coverage_reports branch; pull-requests: write for PR annotations.

Author: enilsen16

.github/workflows/ci-rust.yml

@@ -37,6 +37,9 @@ jobs:
 
   test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
     env:
       FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
     steps: