build: bump tsutils from 3.20.0 to 3.21.0

Bumps [tsutils](https://github.com/ajafff/tsutils) from 3.20.0 to 3.21.0.
- [Release notes](https://github.com/ajafff/tsutils/releases)
- [Changelog](https://github.com/ajafff/tsutils/blob/master/CHANGELOG.md)
- [Commits](ajafff/tsutils@v3.20.0...v3.21.0)

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

Author: dependabot[bot]