devel/level-zero: Update to 1.15.8

Changes:	https://github.com/oneapi-src/level-zero/releases

devel/level-zero/Makefile

 PORTNAME=	level-zero
-PORTVERSION=	1.15.1
+PORTVERSION=	1.15.8
 DISTVERSIONPREFIX=	v
 CATEGORIES=	devel
 

devel/level-zero/distinfo

-TIMESTAMP = 1698340921
-SHA256 (oneapi-src-level-zero-v1.15.1_GH0.tar.gz) = aa96edb85a7953041baf8e7d0b0a0e10fa85673e52f5d0466bc2fc802beb9522
-SIZE (oneapi-src-level-zero-v1.15.1_GH0.tar.gz) = 935483
+TIMESTAMP = 1703227804
+SHA256 (oneapi-src-level-zero-v1.15.8_GH0.tar.gz) = 80663dbd4d01d9519185c6e568f2e836bfea7484363f4da8cf5cf77c3bf58602
+SIZE (oneapi-src-level-zero-v1.15.8_GH0.tar.gz) = 937224