chore(deps-dev): bump webpack-dev-server from 5.2.1 to 5.2.6

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) from 5.2.1 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@v5.2.1...v5.2.6)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.6
  dependency-type: direct:development
...

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

Author: dependabot[bot]