Exception when worker gets Pandas DataFrame as argument

## What OS are you using?

Windows 10

## What version of Dramatiq are you using?

Version: 1.17.0

## What did you do?

I ran into an issue where a dramatiq worker takes a DataFrame to do some processing, and when more than one message is in the queue, the broker raises an exception because MessageProxy's `__eq__` is comparing two messages containing the dataframe argument using `==` which Pandas doesn't like.

Reproducable example:
```python
import pandas as pd
import dramatiq

dramatiq.set_encoder(dramatiq.PickleEncoder())

@dramatiq.actor
def buggy(df: pd.DataFrame):
pass

if __name__ == "__main__":
for _ in range(10): # the bug does not appear if only one message is sent
buggy.send(pd.DataFrame([[1,2,3],[4,5,6]], [1,2]))
```

Starting workers with `dramatiq -t 1 -p 2 bug` (to avoid out of memory issues) and the main program with `python bug.py` results in the following exception

```
[2024-06-22 23:50:51,477] [PID 132100] [Thread-2] [dramatiq.worker.ConsumerThread(default)] [CRITICAL] Consumer encountered an unexpected error.
Traceback (most recent call last):
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\dramatiq\worker.py", line 267, in run
self.handle_message(message)
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\dramatiq\worker.py", line 328, in handle_message
self.work_queue.put((actor.priority, message))
File "C:\Users\Dennis\AppData\Local\Programs\Python\Python311\Lib\queue.py", line 150, in put
self._put(item)
File "C:\Users\Dennis\AppData\Local\Programs\Python\Python311\Lib\queue.py", line 236, in _put
heappush(self.queue, item)
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\dramatiq\broker.py", line 394, in __eq__
return self._message == other._message
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 4, in __eq__
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\pandas\core\generic.py", line 1527, in __nonzero__
raise ValueError(
ValueError: The truth value of a DataFrame is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().
[2024-06-22 23:50:51,480] [PID 132100] [Thread-2] [dramatiq.worker.ConsumerThread(default)] [INFO] Restarting consumer in 3.00 seconds.
```
Immediately followed by
```
Exception in thread Thread-4:
Traceback (most recent call last):
File "C:\Users\Dennis\AppData\Local\Programs\Python\Python311\Lib\threading.py", line 1038, in _bootstrap_inner
self.run()
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\dramatiq\worker.py", line 462, in run
self.process_message(message)
File "C:\Users\Dennis\AppData\Roaming\Python\Python311\site-packages\dramatiq\worker.py", line 525, in process_message
self.work_queue.task_done()
File "C:\Users\Dennis\AppData\Local\Programs\Python\Python311\Lib\queue.py", line 75, in task_done
raise ValueError('task_done() called too many times')
ValueError: task_done() called too many times
```

## What did you expect would happen?

I expected dramatiq to not raise an exception