Bump codecov/codecov-action from 5.0.2 to 5.0.4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.0.2 to 5.0.4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.0.2...v5.0.4)

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

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

.github/workflows/main.linux.temurin.lts.yml

@@ -47,7 +47,7 @@ jobs:
           path: ./com.io7m.zelador.tests/target/surefire-reports
 
       - name: Coverage
-        uses: codecov/[email protected].2
+        uses: codecov/[email protected].4
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           files: com.io7m.zelador.tests/target/site/jacoco-aggregate/jacoco.xml