Bump codecov/codecov-action from 3 to 4 (#10)

* Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [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...v4)

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

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

---------

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

.github/workflows/tests.yml

@@ -60,7 +60,8 @@ jobs:
 
     - name: Upload Coverage to Codecov
       if: ${{ contains(matrix.os, 'ubuntu') }}
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
-        gcov: true
-        gcov_include: matspy/*
+        fail_ci_if_error: true
+        verbose: true
+        token: ${{ secrets.CODECOV_TOKEN }}