Support gevent >= 25.4.1

[jschoeller-atlassian]

Prerequisites

• I am using the latest version of Locust
• I am suggesting a new feature, not asking a question

Description

There is an HTTP request smuggling vulnerability in gevent [,25.4.1). See https://security.snyk.io/vuln/SNYK-PYTHON-GEVENT-9919772

The version of gevent required by locust is currently restricted to <25.0.0. See #3112

Request is to support the use of gevent >= 25.4.1.

[cyberw]

The reason we block gevent 25 is because it breaks compatibility with python-engineio (and thus python-socketio client). Once there's a solution for that, I'd be happy to upgrade!

miguelgrinberg/python-engineio#403

[2025-04-18 08:16:30,396] ERROR/cloud: 'gevent._gevent_cqueue.Queue' object has no attribute 'Empty'
Traceback (most recent call last):
  File "/home/runner/.local/share/uv/tools/locust-cloud/lib/python3.11/site-packages/locust_cloud/cloud.py", line 138, in main
    websocket.connect(
  File "/home/runner/.local/share/uv/tools/locust-cloud/lib/python3.11/site-packages/locust_cloud/websocket.py", line 81, in connect
    self.sio.connect(
  File "/home/runner/.local/share/uv/tools/locust-cloud/lib/python3.11/site-packages/socketio/client.py", line 147, in connect
    self.eio.connect(real_url, headers=real_headers,
  File "/home/runner/.local/share/uv/tools/locust-cloud/lib/python3.11/site-packages/engineio/client.py", line 94, in connect
    self.queue = self.create_queue()
                 ^^^^^^^^^^^^^^^^^^^
  File "/home/runner/.local/share/uv/tools/locust-cloud/lib/python3.11/site-packages/engineio/client.py", line 166, in create_queue
    q.Empty = queue.Empty