⬆️ Bump codecov/codecov-action from 1 to 3 (#81)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Chris Sewell <chrisj_sewell@hotmail.com>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -46,7 +46,7 @@ jobs:
       run: |
         pytest --cov=mdit_py_plugins --cov-report=xml --cov-report=term-missing
     - name: Upload to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
         name: mdit-py-plugins-pytests
         flags: pytests