Bump lz4_flex from 0.12.0 to 0.12.1 in /pixie-uefi

Bumps [lz4_flex](https://github.com/pseitz/lz4_flex) from 0.12.0 to 0.12.1.
- [Release notes](https://github.com/pseitz/lz4_flex/releases)
- [Changelog](https://github.com/PSeitz/lz4_flex/blob/main/CHANGELOG.md)
- [Commits](PSeitz/lz4_flex@0.12.0...0.12.1)

---
updated-dependencies:
- dependency-name: lz4_flex
  dependency-version: 0.12.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pixie-uefi/Cargo.lock

@@ -19,7 +19,7 @@ core_detect = "1.0.0"
 futures = { version = "0.3.32", default-features = false, features = ["alloc", "async-await"] }
 gpt_disk_io = "0.16.2"
 log = "0.4.29"
-lz4_flex = { version = "0.12.0", default-features = false }
+lz4_flex = { version = "0.12.1", default-features = false }
 managed = { version = "0.8.0", default-features = false, features = ["alloc"] }
 minicov = { version = "0.3.8", optional = true }
 postcard = { version = "1.1.3", default-features = false, features = ["alloc"] }