Update usb-device requirement from 0.2 to 0.3 in /examples/rp2040

Updates the requirements on [usb-device](https://github.com/rust-embedded-community/usb-device) to permit the latest version.
- [Release notes](https://github.com/rust-embedded-community/usb-device/releases)
- [Changelog](https://github.com/rust-embedded-community/usb-device/blob/master/CHANGELOG.md)
- [Commits](rust-embedded-community/usb-device@v0.2.0...v0.3.2)

---
updated-dependencies:
- dependency-name: usb-device
  dependency-type: direct:production
...

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

examples/rp2040/Cargo.toml

@@ -11,7 +11,7 @@ cortex-m = "0.7"
 cortex-m-rt = "0.7"
 embedded-hal = { version = "0.2.5", features = ["unproven"] }
 
-usb-device = { version = "0.2", features = ["defmt"] }
+usb-device = { version = "0.3", features = ["defmt"] }
 heapless = { version = "0.7", features = ["defmt-impl"] }
 
 defmt = "0.3"