Python code modernization, 3/n (#1157)

* Remove __metaclass__ = type.

for i in $(grep -REl '__metaclass__ = type' plugins/ tests/); do
  sed -e '/^__metaclass__ = type/d' -i $i;
done

* Remove super arguments, and stop inheriting from object.

tests/unit/plugins/module_utils/_api/api/test_client.py

@@ -8,9 +8,6 @@
 
 from __future__ import annotations
 
-
-__metaclass__ = type
-
 import datetime
 import io
 import json
@@ -483,7 +480,7 @@ class TCPSocketStreamTest(unittest.TestCase):
         stdout_data = cls.stdout_data
         stderr_data = cls.stderr_data
 
-        class Handler(BaseHTTPRequestHandler, object):
+        class Handler(BaseHTTPRequestHandler):
             def do_POST(self):
                 resp_data = self.get_resp_data()
                 self.send_response(101)