build(deps): bump webpack-dev-server and @patternfly/documentation-framework

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) to 5.2.1 and updates ancestor dependency @patternfly/documentation-framework. These dependencies need to be updated together.


Updates `webpack-dev-server` from 5.2.0 to 5.2.1
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v5.2.0...v5.2.1)

Updates `@patternfly/documentation-framework` from 6.5.20 to 6.18.4

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.1
  dependency-type: indirect
- dependency-name: "@patternfly/documentation-framework"
  dependency-version: 6.18.4
  dependency-type: direct:development
...

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Author: dependabot[bot]