build: Bump x86_64 from 0.14.3 to 0.14.4

Bumps [x86_64](https://github.com/rust-osdev/x86_64) from 0.14.3 to 0.14.4.
- [Release notes](https://github.com/rust-osdev/x86_64/releases)
- [Changelog](https://github.com/rust-osdev/x86_64/blob/master/Changelog.md)
- [Commits](rust-osdev/x86_64@v0.14.3...v0.14.4)

---
updated-dependencies:
- dependency-name: x86_64
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -27,7 +27,7 @@ efi-var = []
 
 [dependencies]
 bitflags = "1.2.1"
-x86_64 = "0.14.3"
+x86_64 = "0.14.4"
 atomic_refcell = "0.1.7"
 r-efi = "4.0.0"
 uart_16550 = "0.2.15"