ci: bump codecov/codecov-action from 4 to 5 (#4741)

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](https://github.com/codecov/codecov-action/compare/v4...v5)

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

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

.github/workflows/unit.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Run benchmark tests
         run: go test -v -run=^$ -benchtime 0.5s -bench=. $(go list ./... | grep -v integrationtests/self)
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           files: coverage.txt,coverage-root.txt
           env_vars: OS=${{ matrix.os }}, GO=${{ matrix.go }}