gymnasium.logger.WARN( TypeError: 'int' object is not callable

[WillDudley]

Describe the bug
cooperativepong's render function has the following check:

        if self.render_mode is None:
            gymnasium.logger.WARN(
                "You are calling render method without specifying any render mode."
            )
            return

This doesn't actually hit the message as gymnasium.logger.WARN is an int and thus can't be used.

Code example

from pettingzoo.butterfly import cooperative_pong_v5

env = cooperative_pong_v5.parallel_env()
env.reset()
env.render()

stack trace

Traceback (most recent call last):
  File "/home/will/Repositories/cooppong/main.py", line 7, in <module>
    env.render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/utils/conversions.py", line 177, in render
    return self.aec_env.render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/utils/wrappers/order_enforcing.py", line 64, in render
    return super().render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/utils/wrappers/base.py", line 88, in render
    return self.env.render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/utils/wrappers/base.py", line 88, in render
    return self.env.render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/butterfly/cooperative_pong/cooperative_pong.py", line 426, in render
    return self.env.render()
  File "/home/will/Repositories/cooppong/venv/lib/python3.9/site-packages/pettingzoo/butterfly/cooperative_pong/cooperative_pong.py", line 266, in render
    gymnasium.logger.WARN(
TypeError: 'int' object is not callable

System Info
Describe the characteristic of your environment:

• Describe how Gymnasium was installed (pip, docker, source, ...): pip install pettingzoo[butterfly], no other deps
• Operating system: Ubuntu 20.04
• Python version: 3.9

Additional context
N/A

Checklist

• I have checked that there is no similar issue in the repo (required)