Add myanon to Security section

[myanon](https://github.com/ppomes/myanon) is a streaming anonymizer for MySQL/MariaDB dump files. It reads mysqldump from stdin and writes anonymized data to stdout. Key features: - Deterministic hashing (HMAC-SHA256) preserving referential integrity - Built-in rules: texthash, emailhash, inthash, fixed values, substrings - JSON field anonymization - Python extensions (e.g., Faker) - Written in C, single binary, also available as Docker image - Works with both MySQL and MariaDB dump files Website: https://myanon.io