Bump codecov/codecov-action from 4 to 5 (trixi-framework#2185)

* Bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

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

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

* Update .github/workflows/ci.yml

Co-authored-by: Joshua Lampert <[email protected]>

---------

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

.github/workflows/ci.yml

@@ -133,9 +133,9 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
         with:
           directories: src,examples,ext
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with:
-          file: ./lcov.info
+          files: ./lcov.info
           flags: unittests
           name: codecov-umbrella
           fail_ci_if_error: true