Bump express and @nestjs/platform-express

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

Updates `express` from 4.19.2 to 4.21.2
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.2/History.md)
- [Commits](expressjs/express@4.19.2...4.21.2)

Updates `@nestjs/platform-express` from 10.3.10 to 10.4.15
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](https://github.com/nestjs/nest/commits/v10.4.15/packages/platform-express)

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

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