Bump minimum_zig_version to 0.15.1

Author: hazeycode

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .zgui,
     .fingerprint = 0xe78160e64acbef8,
     .version = "0.6.0-dev",
-    .minimum_zig_version = "0.15.0-dev.1177+9abc3232a",
+    .minimum_zig_version = "0.15.1",
     .paths = .{
         "build.zig",
         "build.zig.zon",