Bump string-length from 4.0.1 to 4.0.2

Bumps [string-length](https://github.com/sindresorhus/string-length) from 4.0.1 to 4.0.2.
- [Release notes](https://github.com/sindresorhus/string-length/releases)
- [Commits](sindresorhus/string-length@v4.0.1...v4.0.2)

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