games/freeciv: update to 3.0.8 release (+)

FreeCiv 3.0.8 is a generic bugfix release in the stable 3.0 series

Changelog	https://freeciv.fandom.com/wiki/NEWS-3.0.8

games/freeciv/Makefile

 PORTNAME=	freeciv
-PORTVERSION=	3.0.7
+PORTVERSION=	3.0.8
 CATEGORIES=	games
 MASTER_SITES=	SF/freeciv/Freeciv%20${PORTVERSION:R}/${PORTVERSION} \
 		http://files.freeciv.org/stable/

games/freeciv/distinfo

-TIMESTAMP = 1681734171
-SHA256 (freeciv-3.0.7.tar.xz) = f6e606f17ed03d971272883f1a4879f5c1c2c247f64b8edefa6a25c8a2a8dac4
-SIZE (freeciv-3.0.7.tar.xz) = 43595776
+TIMESTAMP = 1690135626
+SHA256 (freeciv-3.0.8.tar.xz) = 3b5aa32f628890be1741c3ac942cee82c79c065f8db6baff18d734a5c0e776d4
+SIZE (freeciv-3.0.8.tar.xz) = 43598980