rename gh token in codecov

Author: msaroufim

.github/workflows/coverage.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Post comment
         uses: py-cov-action/python-coverage-comment-action@v3
         with:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GH_TOKEN }}
           GITHUB_PR_RUN_ID: ${{ github.event.workflow_run.id }}
           # Update those if you changed the default values:
           # COMMENT_ARTIFACT_NAME: python-coverage-comment-action