fix: bump minimum_zig_version to 0.15.2

We actually compile with 0.15.0, but there are bugs causing issues with
ts_bin_query_gen. So we bump to 0.15.2 as that is much more stable and
noone should really use 0.15.0 anyway.

fixes #16

build.zig.zon

@@ -2,7 +2,7 @@
     .name = .flow_syntax,
     .version = "0.6.0",
     .fingerprint = 0x3ba2584ea1cec85f,
-    .minimum_zig_version = "0.15.0",
+    .minimum_zig_version = "0.15.2",
 
     .dependencies = .{
         .tree_sitter = .{