package/suricata: security bump to version 6.0.4

Various security, performance, accuracy and stability issues have been
fixed, including two TCP evasion issues. CVE 2021-37592 was assigned.

https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>