Try to expose the codecov token

Author: xrobin

.github/workflows/test-coverage.yaml

@@ -10,6 +10,7 @@ jobs:
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
       RUN_SLOW_TESTS: true
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
     steps:
       - uses: actions/checkout@v4