Remove failing upload to codecov in CI

Author: foster999

.github/workflows/tests.yml

@@ -36,14 +36,6 @@ jobs:
     - name: Run pytest
       run: |
         pytest --cov=sphinx_tabs --cov-report=xml --cov-report=term-missing
-    - name: Upload to Codecov
-      if: matrix.python-version == '3.10' && github.repository == 'executablebooks/sphinx-tabs'
-      uses: codecov/codecov-action@v4
-      with:
-        name: sphinx-tabs-pytests-py3.10
-        flags: pytests
-        file: ./coverage.xml
-        fail_ci_if_error: true
 
   js-tests: