[3.18] community/suricata: security upgrade to 6.0.15
6.0.15 is a security release https://forum.suricata.io/t/suricata-6-0-15-released/4068 but I'm not sure if there are additional CVE numbers assigned to be added to the secfixes section.
CVE-2023-35852 and CVE-2023-35853 were fixed in 6.0.13 https://forum.suricata.io/t/suricata-6-0-13-released/3595