Add Coveralls repo token variable to environment in GitHub Actions wo…

…rkflow.

.github/workflows/lint-test-cover-docs.yml

@@ -27,6 +27,7 @@ jobs:
         if: matrix.python-version == '3.11'
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
       - name: Test auto-generation of documentation.
         run: |
           pip install -U .[docs]