fix(deps): update lz4_flex to 0.12.1 (high GHSA-vvp9-7p8x-rfvv)

[github-actions]

Description

Bumps lz4_flex to resolve a high severity vulnerability.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Security Alert

• Alert: https://github.com/okx/xlayer-reth/security/dependabot/14
• CVE / ID: GHSA-vvp9-7p8x-rfvv
• Severity: high
• Vulnerable range: >= 0.12.0, < 0.12.1
• Fixed in: 0.12.1

Change

Updated transitive dependency lz4_flex from 0.12.0 to 0.12.1 via cargo update lz4_flex --precise 0.12.1. Only Cargo.lock is modified; no direct dependency declarations changed.

Checklist

• I have reviewed the relevant code guidelines in the docs/ folder
• My code follows the coding standards of this project
• I have performed a self-review of my own code