build(deps): bump lz4_flex from 0.11.3 to 0.11.6

Bumps [lz4_flex](https://github.com/pseitz/lz4_flex) from 0.11.3 to 0.11.6.
- [Release notes](https://github.com/pseitz/lz4_flex/releases)
- [Changelog](https://github.com/PSeitz/lz4_flex/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pseitz/lz4_flex/commits/0.11.6)

---
updated-dependencies:
- dependency-name: lz4_flex
  dependency-version: 0.11.6
  dependency-type: indirect
...

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

Author: dependabot[bot]