build(deps): bump codecov/codecov-action from 2.1.0 to 3.1.1

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.1.0 to 3.1.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v2.1.0...v3.1.1)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/pythonapp.yml

@@ -43,7 +43,7 @@ jobs:
       env:
         PYTHONDEVMODE: 1
         PYTHONPATH: .
-    - uses: codecov/codecov-action@v2.1.0
+    - uses: codecov/codecov-action@v3.1.1
       with:
         name: build-${{ matrix.python-ver }}
         fail_ci_if_error: true