PYTHON-5729 Pin setuptools when using older gevent (#2708)

Author: blink1073

.evergreen/run-tests.sh

@@ -38,6 +38,7 @@ trap "cleanup_tests" SIGINT ERR
 
 # Start the test runner.
 echo "Running tests with UV_PYTHON=${UV_PYTHON:-}..."
+echo "UV_ARGS=${UV_ARGS}"
 uv run ${UV_ARGS} --reinstall-package pymongo .evergreen/scripts/run_tests.py "$@"
 echo "Running tests with UV_PYTHON=${UV_PYTHON:-}... done."
 

.evergreen/scripts/setup_tests.py

@@ -466,6 +466,9 @@ def handle_test_env() -> None:
     if opts.green_framework:
         framework = opts.green_framework or os.environ["GREEN_FRAMEWORK"]
         UV_ARGS.append(f"--group {framework}")
+        if framework == "gevent" and opts.test_min_deps:
+            # PYTHON-5729.  This can be removed when the min supported gevent is moved to 25.9.1.
+            UV_ARGS.append('--with "setuptools==81.0"')
 
     else:
         TEST_ARGS = f"-v --durations=5 {TEST_ARGS}"