Bump textlint from 15.1.0 to 15.2.1

Bumps [textlint](https://github.com/textlint/textlint) from 15.1.0 to 15.2.1.
- [Release notes](https://github.com/textlint/textlint/releases)
- [Commits](textlint/textlint@v15.1.0...v15.2.1)

---
updated-dependencies:
- dependency-name: textlint
  dependency-version: 15.2.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]