Add minimum_zig_version

Author: Hejsil

Diff for: build.zig.zon

@@ -1,6 +1,7 @@
 .{
     .name = .mecha,
     .version = "0.9.0",
+    .minimum_zig_version = "0.14.0",
     .fingerprint = 0x767886c8489a5175,
     .paths = .{"."},
 }