devel/go-tools: update to 0.28.0

 - dependency bump

Changelog: https://github.com/golang/tools/compare/v0.27.0...v0.28.0

devel/go-tools/Makefile

 PORTNAME=	tools
 DISTVERSIONPREFIX=	v
-DISTVERSION=	0.27.0
+DISTVERSION=	0.28.0
 PORTEPOCH=	1
 CATEGORIES=	devel
 PKGNAMEPREFIX=	go-

devel/go-tools/distinfo

-TIMESTAMP = 1732108202
-SHA256 (go/devel_go-tools/tools-v0.27.0/v0.27.0.mod) = ac8b70b92895457df1fcdfe4961a8cb6f3278fe857ec4f56562c708f1990a261
-SIZE (go/devel_go-tools/tools-v0.27.0/v0.27.0.mod) = 341
-SHA256 (go/devel_go-tools/tools-v0.27.0/v0.27.0.zip) = c568990def8355c800b9df8bfdbcff20d86ba07399e607b215990574c96749eb
-SIZE (go/devel_go-tools/tools-v0.27.0/v0.27.0.zip) = 3267756
+TIMESTAMP = 1733745112
+SHA256 (go/devel_go-tools/tools-v0.28.0/v0.28.0.mod) = 213a43730423ea5377848091f7b95d90d89d756b848d3fce487eaf30e59ef90f
+SIZE (go/devel_go-tools/tools-v0.28.0/v0.28.0.mod) = 342
+SHA256 (go/devel_go-tools/tools-v0.28.0/v0.28.0.zip) = 3ac1c5530724296b8ed1f5b3df6c2aa1f6312371ab20812ad5fcb35ceaf2a177
+SIZE (go/devel_go-tools/tools-v0.28.0/v0.28.0.zip) = 3301056