Update usb-device requirement from 0.2.7 to 0.3.2 in /examples/usb

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@v0.2.7...v0.3.2)

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

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

Author: dependabot[bot]

examples/usb/Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 [dependencies]
 cortex-m-rt = "0.7.0"
 panic-semihosting = "0.6.0"
-usb-device = "0.2.7"
+usb-device = "0.3.2"
 usbd-serial = "0.1.0"
 
 [dependencies.nrf52840-hal]