build(deps): bump express and @nestjs/core in /examples/nest-v5x

Removes [express](https://github.com/expressjs/express). It's no longer used after updating ancestor dependency [@nestjs/core](https://github.com/nestjs/nest). These dependencies need to be updated together.


Removes `express`

Updates `@nestjs/core` from 5.5.0 to 9.2.1
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](nestjs/nest@v5.5.0...v9.2.1)

---
updated-dependencies:
- dependency-name: express
  dependency-type: indirect
- dependency-name: "@nestjs/core"
  dependency-type: direct:production
...

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

Author: dependabot[bot]