build(deps): bump golang.org/x/net in /tutorials/whatsup

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.48.0 to 0.55.0.
- [Commits](https://github.com/golang/net/compare/v0.48.0...v0.55.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-version: 0.55.0
  dependency-type: indirect
...

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