ci: bump codecov/codecov-action from 3.1.0 to 5.4.3

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.0 to 5.4.3.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3.1.0...v5.4.3)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: 5.4.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci-test.yaml

@@ -63,7 +63,7 @@ jobs:
           go mod tidy -v -x -compat=1.24  # goreleaser does the same; can find lingering issues
           echo TIDY RESULTS START; git diff || true; echo TIDY RESULTS END
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v3.1.0
+        uses: codecov/codecov-action@v5.4.3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.txt