chore(deps): bump the npm-dependencies group across 1 directory with 3 updates

Bumps the npm-dependencies group with 3 updates in the /actions/helm/generate-docs directory: [@textlint/textlint-plugin-markdown](https://github.com/textlint/textlint), [prettier](https://github.com/prettier/prettier) and [textlint](https://github.com/textlint/textlint).


Updates `@textlint/textlint-plugin-markdown` from 15.4.0 to 15.4.1
- [Release notes](https://github.com/textlint/textlint/releases)
- [Commits](textlint/textlint@v15.4.0...v15.4.1)

Updates `prettier` from 3.7.3 to 3.7.4
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.7.3...3.7.4)

Updates `textlint` from 15.4.0 to 15.4.1
- [Release notes](https://github.com/textlint/textlint/releases)
- [Commits](textlint/textlint@v15.4.0...v15.4.1)

---
updated-dependencies:
- dependency-name: "@textlint/textlint-plugin-markdown"
  dependency-version: 15.4.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
- dependency-name: prettier
  dependency-version: 3.7.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
- dependency-name: textlint
  dependency-version: 15.4.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
...

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

Author: dependabot[bot]