build: Bump uart_16550 from 0.4.0 to 0.6.0

Bumps [uart_16550](https://github.com/rust-osdev/uart_16550) from 0.4.0 to 0.6.0.
- [Release notes](https://github.com/rust-osdev/uart_16550/releases)
- [Changelog](https://github.com/rust-osdev/uart_16550/blob/v0.6.0/CHANGELOG.md)
- [Commits](rust-osdev/uart_16550@v0.4.0...v0.6.0)

---
updated-dependencies:
- dependency-name: uart_16550
  dependency-version: 0.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -39,7 +39,7 @@ fdt = "0.1.5"
 chrono = { version = "0.4", default-features = false }
 
 [target.'cfg(target_arch = "x86_64")'.dependencies]
-uart_16550 = "0.4.0"
+uart_16550 = "0.6.0"
 x86_64 = { version = "0.15.4", default-features = false, features = [
     "instructions",
 ] }