chore(deps): Bump the npm_and_yarn group group

Bumps the npm_and_yarn group group in /examples/blockly-rtc with 2 updates: [webpack-dev-server](https://github.com/webpack/webpack-dev-server) and [webpack-dev-middleware](https://github.com/webpack/webpack-dev-middleware).


Updates `webpack-dev-server` from 3.11.0 to 5.0.4
- [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@v3.11.0...v5.0.4)

Updates `webpack-dev-middleware` from 3.7.2 to 7.1.1
- [Release notes](https://github.com/webpack/webpack-dev-middleware/releases)
- [Changelog](https://github.com/webpack/webpack-dev-middleware/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-middleware@v3.7.2...v7.1.1)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-type: direct:development
  dependency-group: npm_and_yarn-security-group
- dependency-name: webpack-dev-middleware
  dependency-type: indirect
  dependency-group: npm_and_yarn-security-group
...

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