Bump webpack-dev-server and 10up-toolkit

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) to 5.2.2 and updates ancestor dependency [10up-toolkit](https://github.com/10up/10up-toolkit/tree/HEAD/packages/toolkit). These dependencies need to be updated together.


Updates `webpack-dev-server` from 4.15.2 to 5.2.2
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/main/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.15.2...v5.2.2)

Updates `10up-toolkit` from 6.5.0 to 6.5.1
- [Release notes](https://github.com/10up/10up-toolkit/releases)
- [Changelog](https://github.com/10up/10up-toolkit/blob/[email protected]/packages/toolkit/CHANGELOG.md)
- [Commits](https://github.com/10up/10up-toolkit/commits/[email protected]/packages/toolkit)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.2
  dependency-type: indirect
- dependency-name: 10up-toolkit
  dependency-version: 6.5.1
  dependency-type: direct:development
...

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

Author: dependabot[bot]