chore(deps): bump the npm-dependencies group across 1 directory with 2 updates

Bumps the npm-dependencies group with 2 updates in the /actions/helm/generate-docs directory: [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) and [prettier](https://github.com/prettier/prettier).


Updates `markdownlint-cli2` from 0.22.1 to 0.23.0
- [Changelog](https://github.com/DavidAnson/markdownlint-cli2/blob/main/CHANGELOG.md)
- [Commits](DavidAnson/markdownlint-cli2@v0.22.1...v0.23.0)

Updates `prettier` from 3.8.4 to 3.9.4
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.8.4...3.9.4)

---
updated-dependencies:
- dependency-name: markdownlint-cli2
  dependency-version: 0.23.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
- dependency-name: prettier
  dependency-version: 3.9.4
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
...

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

Author: dependabot[bot]

actions/helm/generate-docs/package-lock.json

@@ -8,8 +8,8 @@
 	},
 	"dependencies": {
 		"@textlint/textlint-plugin-markdown": "^15.7.1",
-		"markdownlint-cli2": "^0.22.1",
-		"prettier": "^3.8.3",
+		"markdownlint-cli2": "^0.23.0",
+		"prettier": "^3.9.4",
 		"textlint": "^15.7.1",
 		"textlint-filter-rule-comments": "^1.3.0",
 		"textlint-rule-terminology": "^5.2.16"