Bump mypy to 1.9, add to json.encoder, small fixups (#11549)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stubs/gevent/@tests/stubtest_allowlist.txt

@@ -74,7 +74,6 @@ gevent.ssl.base64
 gevent.ssl.create_connection
 gevent.ssl.errno
 gevent.ssl.os
-gevent.ssl.socket_error
 gevent.ssl.warnings
 gevent\.subprocess\._[A-Za-z0-9]\w*
 
@@ -147,11 +146,7 @@ gevent.Greenlet.link_value
 gevent.greenlet.Greenlet.link
 gevent.greenlet.Greenlet.link_exception
 gevent.greenlet.Greenlet.link_value
-gevent._ffi.watcher.IoMixin.__init__
 gevent._threading.Queue.qsize
-gevent.monkey.patch_module
-gevent.monkey.patch_ssl
-gevent.monkey.patch_thread
 
 # removed deprecated argument
 gevent._hub_primitives.wait_readwrite
@@ -195,22 +190,10 @@ gevent.ssl.get_server_certificate
 # for now we ignore that fact, most of the ways to call Popen should be compatible
 gevent.subprocess.Popen.__init__
 
-# we exclude the undocumented internal argument _raise_exc from the stubs
-gevent.subprocess.Popen.wait
-
-# we exclude the undocumented internal argument _format_hub from the stubs
-gevent.threadpool.ThreadPool.__repr__
-
 # gevent overwrites with a named parameter for fd, but we're fine with only
 # supporting the API of the superclass
 gevent.threadpool.ThreadPoolExecutor.submit
 
-# we exclude the undocumented internal argument _one_shot from the stubs
-gevent.Timeout.__init__
-gevent.Timeout.start_new
-gevent.timeout.Timeout.__init__
-gevent.timeout.Timeout.start_new
-
 # Error: is not a type/function
 # =====================
 # zope.interface related errors, these shouldn't matter