build(deps): bump the npm_and_yarn group across 1 directory with 2 up…

…dates (#520)

Bumps the npm_and_yarn group with 2 updates in the /backend/streetdrop-admin/streetdrop-admin-web directory: [serve-static](https://github.com/expressjs/serve-static) and [express](https://github.com/expressjs/express).


Updates `serve-static` from 1.15.0 to 1.16.2
- [Release notes](https://github.com/expressjs/serve-static/releases)
- [Changelog](https://github.com/expressjs/serve-static/blob/v1.16.2/HISTORY.md)
- [Commits](expressjs/serve-static@v1.15.0...v1.16.2)

Updates `express` from 4.18.2 to 4.21.1
- [Release notes](https://github.com/expressjs/express/releases)
- [Changelog](https://github.com/expressjs/express/blob/4.21.1/History.md)
- [Commits](expressjs/express@4.18.2...4.21.1)

---
updated-dependencies:
- dependency-name: serve-static
  dependency-type: indirect
  dependency-group: npm_and_yarn
- dependency-name: express
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>