Bump webpack-dev-server and gatsby

Removes [webpack-dev-server](https://github.com/webpack/webpack-dev-server). It's no longer used after updating ancestor dependency [gatsby](https://github.com/gatsbyjs/gatsby). These dependencies need to be updated together.


Removes `webpack-dev-server`

Updates `gatsby` from 2.22.10 to 5.14.5
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/compare/gatsby@2.22.10...gatsby@5.14.5)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 
  dependency-type: indirect
- dependency-name: gatsby
  dependency-version: 5.14.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]