games/exult-devel: Update to 20231214 snapshot

ChangeLog:
https://github.com/exult/exult/compare/snapshot-v1.9.0.20231116...snapshot-v1.9.0.20231214

games/exult-devel/Makefile

 DISTVERSIONPREFIX=	snapshot-v
-DISTVERSION=	1.9.0.20231116
-PORTREVISION=	1
+DISTVERSION=	1.9.0.20231214
+PORTREVISION=	0 # Do not remove PORTREVISION or it will be set to master
 PKGNAMESUFFIX=	-devel
 
 CONFLICTS_INSTALL=	exult

games/exult-devel/distinfo

-TIMESTAMP = 1700128495
-SHA256 (exult-exult-snapshot-v1.9.0.20231116_GH0.tar.gz) = 2b2a1aff42bd7c2fb578fb59ef42596bba5a0cef79780cdba04ed42ea1aa5d41
-SIZE (exult-exult-snapshot-v1.9.0.20231116_GH0.tar.gz) = 19316895
+TIMESTAMP = 1702557314
+SHA256 (exult-exult-snapshot-v1.9.0.20231214_GH0.tar.gz) = e6da700996cff5006d7e4b29b78788c142e8d95c226ae3e72b891c45ebc7b10c
+SIZE (exult-exult-snapshot-v1.9.0.20231214_GH0.tar.gz) = 19315862