text: Title: pymysql Connection.ping AttributeError
  Body: ### Describe the bug
  
  sqlalchemy with PyMySQL 0.9.3 ping cause exception.
  
  ### Optional link from https://docs.sqlalchemy.org which documents the behavior that is expected
  
  _No response_
  
  ### SQLAlchemy Version in Use
  
  2.0.23 1.4.50
  
  ### DBAPI (i.e. the database driver)
  
  pymysql
  
  ### Database Vendor and Major Version
  
  MySQL 8
  
  ### Python Version
  
  3.9
  
  ### Operating system
  
  Linux
  
  ### To Reproduce
  
  ```python
  from sqlalchemy import create_engine
  from sqlalchemy import text
  
  SQLALCHEMY_DATABASE_URI='mysql+pymysql://xxxx:xxxx@xxxx:3306/mysql'
  
  engine = create_engine(SQLALCHEMY_DATABASE_URI, pool_pre_ping=True, pool_size=1)
  
  def test():
      with engine.connect() as conn:
          conn.execute(text("select user from mysql.user limit 1"))
  
  for _ in range(2):
      test()
  ```
  
  
  ### Error
  
  ```
  Traceback (most recent call last):
    File "/workspace/test-env/../greatrds/.vscode/test.py", line 13, in <module>
      test()
    File "/workspace/test-env/../greatrds/.vscode/test.py", line 9, in test
      with engine.connect() as conn:
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 3268, in connect
      return self._connection_cls(self)
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 145, in __init__
      self._dbapi_connection = engine.raw_connection()
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/engine/base.py", line 3292, in raw_connection
      return self.pool.connect()
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 452, in connect
      return _ConnectionFairy._checkout(self)
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 1378, in _checkout
      del fairy
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 146, in __exit__
      raise exc_value.with_traceback(exc_tb)
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/pool/base.py", line 1306, in _checkout
      result = pool._dialect._do_ping_w_event(
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/engine/default.py", line 709, in _do_ping_w_event
      return self.do_ping(dbapi_connection)
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/dialects/mysql/pymysql.py", line 104, in do_ping
      if self._send_false_to_ping:
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/util/langhelpers.py", line 1146, in __get__
      obj.__dict__[self.__name__] = result = self.fget(obj)
    File "/workspace/test-env/venv/lib/python3.9/site-packages/sqlalchemy/dialects/mysql/pymysql.py", line 93, in _send_false_to_ping
      insp = langhelpers.get_callable_argspec(Connection.ping)
  AttributeError: 'function' object has no attribute 'ping'
  ```
  
  ### Additional context
  
  Package    Version
  ---------- -------
  greenlet   3.0.1
  pip        21.2.4
  PyMySQL    0.9.3
  setuptools 58.1.0
  SQLAlchemy 1.4.50
  