Bump codecov/codecov-action from 3.1.2 to 4.0.1 (#78)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.2 to 4.0.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3.1.2...v4.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/fortnightly.yml

@@ -59,6 +59,6 @@ jobs:
       run: tox ${{ matrix.toxargs }} -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
     - name: Upload coverage to codecov
       if: ${{ contains(matrix.toxenv,'-cov') }}
-      uses: codecov/codecov-action@v3.1.2
+      uses: codecov/codecov-action@v4.0.1
       with:
         file: ./coverage.xml

.github/workflows/testing.yml

@@ -55,7 +55,7 @@ jobs:
       run: tox ${{ matrix.toxargs }} -e ${{ matrix.toxenv }} -- ${{ matrix.toxposargs }}
     - name: Upload coverage to codecov
       if: ${{ contains(matrix.toxenv,'-cov') }}
-      uses: codecov/codecov-action@v3.1.2
+      uses: codecov/codecov-action@v4.0.1
       with:
         file: ./coverage.xml
   documentation: