Bump webpack-dev-server and @wordpress/scripts

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) to 5.2.6 and updates ancestor dependency [@wordpress/scripts](https://github.com/WordPress/gutenberg/tree/HEAD/packages/scripts). These dependencies need to be updated together.


Updates `webpack-dev-server` from 4.15.2 to 5.2.6
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v5.2.6/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.15.2...v5.2.6)

Updates `@wordpress/scripts` from 31.4.0 to 34.0.0
- [Release notes](https://github.com/WordPress/gutenberg/releases)
- [Changelog](https://github.com/WordPress/gutenberg/blob/trunk/packages/scripts/CHANGELOG.md)
- [Commits](https://github.com/WordPress/gutenberg/commits/@wordpress/components@34.0.0/packages/scripts)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.6
  dependency-type: indirect
- dependency-name: "@wordpress/scripts"
  dependency-version: 34.0.0
  dependency-type: direct:development
...

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Author: dependabot[bot]