Add _thread.start_joinable_thread and _thread.lock for 3.13 (#12588)

stdlib/@tests/stubtest_allowlists/common.txt

@@ -184,9 +184,6 @@ xml.sax.expatreader
 # Module members that exist at runtime, but are missing from stubs
 # ==========
 _json.encode_basestring
-_thread.LockType.acquire_lock
-_thread.LockType.locked_lock
-_thread.LockType.release_lock
 _thread.RLock
 _thread.allocate
 _thread.exit_thread

stdlib/@tests/stubtest_allowlists/py313.txt

@@ -3,8 +3,6 @@
 # =========================
 
 # TODO: triage these new errors
-_thread.lock
-_thread.start_joinable_thread
 _tkinter.create
 doctest.TestResults.__doc__
 doctest.TestResults.__new__