Remove unneeded free-threading suppressions

The underlying races were fixed in pythongh-117830 and pythongh-117828

Author: mpage

Tools/tsan/suppressions_free_threading.txt

@@ -44,8 +44,6 @@ race:PyMember_SetOne
 race:new_reference
 race:set_contains_key
 race:set_inheritable
-race:start_the_world
-race:tstate_set_detached
 race:unicode_hash
 race:update_cache
 race:update_cache_gil_disabled