build(deps): bump express and @appium/base-driver in /appium

Bumps [express](https://github.com/expressjs/express) and [@appium/base-driver](https://github.com/appium/appium/tree/HEAD/packages/base-driver). These dependencies needed to be updated together.

Updates `express` from 4.19.2 to 4.21.0
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.0/History.md)
- [Commits](expressjs/express@4.19.2...4.21.0)

Updates `@appium/base-driver` from 9.11.1 to 9.11.4
- [Release notes](https://github.com/appium/appium/releases)
- [Changelog](https://github.com/appium/appium/blob/master/packages/base-driver/CHANGELOG.md)
- [Commits](https://github.com/appium/appium/commits/@appium/[email protected]/packages/base-driver)

---
updated-dependencies:
- dependency-name: express
  dependency-type: indirect
- dependency-name: "@appium/base-driver"
  dependency-type: indirect
...

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