[release/2.x] Use the version of gn that works on old Apline#2712

mattleibow merged 1 commit into

release/2.xmono/SkiaSharp:release/2.xfrom

backport/pr-2711-to-release/2.xmono/SkiaSharp:backport/pr-2711-to-release/2.xCopy head branch name to clipboard