build(deps-dev): bump is-string from 1.0.7 to 1.1.1

Bumps [is-string](https://github.com/inspect-js/is-string) from 1.0.7 to 1.1.1.
- [Changelog](https://github.com/inspect-js/is-string/blob/main/CHANGELOG.md)
- [Commits](inspect-js/is-string@v1.0.7...v1.1.1)

---
updated-dependencies:
- dependency-name: is-string
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]