Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.3.0 to 0.4.0.
- [Commits](https://github.com/golang/sync/compare/v0.3.0...v0.4.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sync
  dependency-type: direct:production
  update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>