Bump FreeType compat version

Gnimuc · Gnimuc · commit d7384be1829f · 2021-04-12T23:13:32.000+09:00
diff --git a/Project.toml b/Project.toml
@@ -12,7 +12,7 @@ StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
 [compat]
 ColorVectorSpace = "0.8"
 Colors = "0.11, 0.12"
-FreeType = "3"
+FreeType = "3, 4"
 GeometryBasics = "0.2, 0.3"
 StaticArrays = "0.12, 1.0"
 julia = "1"
