package/zlog: security bump to version 1.2.18
Fixes the following security issue:
CVE-2024-22857: Heap based buffer flow in zlog v1.1.0 to v1.2.17 in
zlog_rule_new()
https://github.com/advisories/GHSA-6q5p-rp5c-wmph
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>