net/sslh: Update to 2.2.4

Changelog:

• Fix CVE-2025-46806 for "Misaligned Memory Accesses in is_openvpn_protocol()"
• Fix CVE-2025-46807 for "File Descriptor Exhaustion in sslh-select and sslh-ev"
• Fix potential parsing of undefined data in syslog probe (no CVE assigned)