Make frozen Time Ractor-shareable

time.c

@@ -1797,7 +1797,8 @@ time_memsize(const void *tobj)
 static const rb_data_type_t time_data_type = {
     "time",
     {time_mark, RUBY_TYPED_DEFAULT_FREE, time_memsize,},
-    0, 0, RUBY_TYPED_FREE_IMMEDIATELY
+    0, 0,
+    (RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_FROZEN_SHAREABLE),
 };
 
 static VALUE