devel/R-cran-data.table: Update to 1.15.0

ChangeLog: https://cran.r-project.org/web/packages/data.table/news/news.html

devel/R-cran-data.table/Makefile

 PORTNAME=	data.table
-DISTVERSION=	1.14.10
+DISTVERSION=	1.15.0
 CATEGORIES=	devel
 DISTNAME=	${PORTNAME}_${DISTVERSION}
 

devel/R-cran-data.table/distinfo

-TIMESTAMP = 1702137460
-SHA256 (data.table_1.14.10.tar.gz) = 014b41eb71a8ddad504baeaa3a2fbbf03406783f00f3adcce48567692978627e
-SIZE (data.table_1.14.10.tar.gz) = 5311651
+TIMESTAMP = 1706780199
+SHA256 (data.table_1.15.0.tar.gz) = 39b7db5dbc76fed91ac60bc351f37a0275a51f306120086b5cd92c1062241062
+SIZE (data.table_1.15.0.tar.gz) = 5385187