Update smoltcp requirement from 0.9.1 to 0.11.0 in /examples/rp2040

Updates the requirements on [smoltcp](https://github.com/smoltcp-rs/smoltcp) to permit the latest version.
- [Release notes](https://github.com/smoltcp-rs/smoltcp/releases)
- [Changelog](https://github.com/smoltcp-rs/smoltcp/blob/main/CHANGELOG.md)
- [Commits](smoltcp-rs/smoltcp@v0.9.1...v0.11.0)

---
updated-dependencies:
- dependency-name: smoltcp
  dependency-type: direct:production
...

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

examples/rp2040/Cargo.toml

@@ -18,7 +18,7 @@ defmt = "0.3"
 defmt-rtt = "0.4"
 panic-probe = { version = "0.3", features = ["print-defmt"] }
 
-smoltcp = { version = "0.9.1", default-features = false, features = [
+smoltcp = { version = "0.11.0", default-features = false, features = [
     "defmt",
     "socket-tcp",
     "socket-dhcpv4",