chore(deps): bump golang.org/x/sync from 0.19.0 to 0.20.0 in /core (#1187)

Bumps [golang.org/x/sync](https://github.com/golang/sync) from 0.19.0 to 0.20.0.
- [Commits](https://github.com/golang/sync/compare/v0.19.0...v0.20.0)

---
updated-dependencies:
- dependency-name: golang.org/x/sync
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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