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), [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) and [textlint](https://github.com/textlint/textlint).


Updates `@textlint/textlint-plugin-markdown` from 15.4.1 to 15.5.0
- [Release notes](https://github.com/textlint/textlint/releases)
- [Commits](textlint/textlint@v15.4.1...v15.5.0)

Updates `markdownlint-cli2` from 0.19.1 to 0.20.0
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.19.1...v0.20.0)

Updates `textlint` from 15.4.1 to 15.5.0
- [Release notes](https://github.com/textlint/textlint/releases)
- [Commits](textlint/textlint@v15.4.1...v15.5.0)

---
updated-dependencies:
- dependency-name: "@textlint/textlint-plugin-markdown"
  dependency-version: 15.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
- dependency-name: markdownlint-cli2
  dependency-version: 0.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
- dependency-name: textlint
  dependency-version: 15.5.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
...

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Author: dependabot[bot]