Remove usage of watchdog_gevent compatibility library

[LincolnPuzey]

The latest watchdog+gevent seems to work together with no extra changes (gorakhargosh/watchdog#306). Bump dramatiq's required versions of them to latest.

[LincolnPuzey]

I also ran the skipped-on-ci tests in test-watch.py:

python3 pytest-gevent.py "tests/test_watch.py"

which passed

[LincolnPuzey]

Example restarting an app when running with gevent

~/PycharmProjects/dramatiq$ PYTHONWARNINGS=all  dramatiq-gevent my_app --watch .
[2025-11-29 11:32:58,158] [PID 15914] [MainThread] [dramatiq.WorkerProcess(3)] [INFO] Worker process is ready for action.
[2025-11-29 11:32:58,160] [PID 15910] [MainThread] [dramatiq.MainProcess] [INFO] Dramatiq '2.0.0' is booting up.
[2025-11-29 11:32:58,154] [PID 15912] [MainThread] [dramatiq.WorkerProcess(1)] [INFO] Worker process is ready for action.
[2025-11-29 11:32:58,151] [PID 15911] [MainThread] [dramatiq.WorkerProcess(0)] [INFO] Worker process is ready for action.
[2025-11-29 11:32:58,156] [PID 15913] [MainThread] [dramatiq.WorkerProcess(2)] [INFO] Worker process is ready for action.
[2025-11-29 11:33:06,575] [PID 15910] [Thread-1] [SourceChangesHandler] [INFO] Detected changes to '/home/lincoln/PycharmProjects/dramatiq/my_app/__init__.py'.
[2025-11-29 11:33:06,575] [PID 15910] [Thread-1] [dramatiq.MainProcess] [INFO] Sending signal 'SIGHUP' to subprocesses...
[2025-11-29 11:33:06,575] [PID 15912] [Dummy-14] [dramatiq.WorkerProcess(1)] [INFO] Stopping worker process...
[2025-11-29 11:33:06,575] [PID 15911] [Dummy-14] [dramatiq.WorkerProcess(0)] [INFO] Stopping worker process...
[2025-11-29 11:33:06,575] [PID 15913] [Dummy-14] [dramatiq.WorkerProcess(2)] [INFO] Stopping worker process...
[2025-11-29 11:33:06,575] [PID 15914] [Dummy-14] [dramatiq.WorkerProcess(3)] [INFO] Stopping worker process...
[2025-11-29 11:33:06,577] [PID 15914] [Dummy-14] [dramatiq.WorkerProcess(3)] [WARNING] Killing worker process...
[2025-11-29 11:33:06,578] [PID 15914] [MainThread] [dramatiq.WorkerProcess(3)] [WARNING] Killing worker process...
[2025-11-29 11:33:06,577] [PID 15910] [Thread-1] [SourceChangesHandler] [INFO] Detected changes to '/home/lincoln/PycharmProjects/dramatiq/my_app/__init__.py'.
[2025-11-29 11:33:06,577] [PID 15910] [Thread-1] [dramatiq.MainProcess] [INFO] Sending signal 'SIGHUP' to subprocesses...
[2025-11-29 11:33:06,577] [PID 15910] [Thread-1] [SourceChangesHandler] [INFO] Detected changes to '/home/lincoln/PycharmProjects/dramatiq/my_app/__init__.py'.
[2025-11-29 11:33:06,577] [PID 15910] [Thread-1] [dramatiq.MainProcess] [INFO] Sending signal 'SIGHUP' to subprocesses...
[2025-11-29 11:33:06,577] [PID 15912] [Dummy-14] [dramatiq.WorkerProcess(1)] [WARNING] Killing worker process...
[2025-11-29 11:33:06,577] [PID 15911] [Dummy-14] [dramatiq.WorkerProcess(0)] [WARNING] Killing worker process...
[2025-11-29 11:33:06,578] [PID 15913] [Dummy-14] [dramatiq.WorkerProcess(2)] [WARNING] Killing worker process...
[2025-11-29 11:33:07,938] [PID 15940] [MainThread] [dramatiq.WorkerProcess(3)] [INFO] Worker process is ready for action.
[2025-11-29 11:33:07,944] [PID 15910] [MainThread] [dramatiq.MainProcess] [INFO] Dramatiq '2.0.0' is booting up.
[2025-11-29 11:33:07,941] [PID 15938] [MainThread] [dramatiq.WorkerProcess(1)] [INFO] Worker process is ready for action.
[2025-11-29 11:33:07,941] [PID 15937] [MainThread] [dramatiq.WorkerProcess(0)] [INFO] Worker process is ready for action.
[2025-11-29 11:33:07,941] [PID 15939] [MainThread] [dramatiq.WorkerProcess(2)] [INFO] Worker process is ready for action.