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]>

.github/workflows/publish-test-results.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event.workflow_run.conclusion != 'skipped' && github.repository_owner == 'Uninett'
 
     steps:
-      # Checking out the repo is necessary codecov/codecov-action@v4 to work properly
+      # Checking out the repo is necessary codecov/codecov-action@v5 to work properly
       # Codecov requires source code to process the coverage file and generate coverage
       # reports
       - name: Checkout Code
@@ -60,7 +60,7 @@ jobs:
           fi
 
       - name: "Upload coverage to Codecov"
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}