Bump lz4_flex from 0.11.5 to 0.12.0 (RustPython#6367)

Bumps [lz4_flex](https://github.com/pseitz/lz4_flex) from 0.11.5 to 0.12.0.
- [Release notes](https://github.com/pseitz/lz4_flex/releases)
- [Changelog](https://github.com/PSeitz/lz4_flex/blob/main/CHANGELOG.md)
- [Commits](PSeitz/lz4_flex@0.11.5...0.12.0)

---
updated-dependencies:
- dependency-name: lz4_flex
  dependency-version: 0.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ itertools = { workspace = true }
 malachite-bigint = { workspace = true }
 num-complex = { workspace = true }
 
-lz4_flex = "0.11"
+lz4_flex = "0.12"
 
 [lints]
 workspace = true