Declare TypedData with RUBY_TYPED_THREAD_SAFE_FREE

Available on Ruby 4.1: [Feature #22067]

Ref: https://bugs.ruby-lang.org/issues/22067

When available this flag superseed RUBY_TYPED_FREE_IMMEDIATELY
and allow parallel sweeping of the type.

Author: byroot

ext/bigdecimal/bigdecimal.c

@@ -208,14 +208,18 @@ BigDecimal_memsize(const void *ptr)
 #endif
 }
 
+#ifndef RUBY_TYPED_THREAD_SAFE_FREE
+#define RUBY_TYPED_THREAD_SAFE_FREE RUBY_TYPED_FREE_IMMEDIATELY
+#endif
+
 static const rb_data_type_t BigDecimal_data_type = {
     .wrap_struct_name = "BigDecimal",
     .function = {
         .dmark = 0,
         .dfree = RUBY_DEFAULT_FREE,
         .dsize = BigDecimal_memsize,
     },
-    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_FROZEN_SHAREABLE | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE,
+    .flags = RUBY_TYPED_THREAD_SAFE_FREE | RUBY_TYPED_FROZEN_SHAREABLE | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE,
 };
 
 static VALUE