[FIX] service: do not break on gevent 1.3

gevent 1.3.0 removed backward compatibility on gevent.wsgi.
make the new path the default

While the recommanded version on requirements.txt is 1.1, a server can not
launched with the 1.3

Closes #24780
Fixes #24779

odoo/service/server.py

@@ -356,7 +356,10 @@ class GeventServer(CommonServer):
 
     def start(self):
         import gevent
-        from gevent.wsgi import WSGIServer
+        try:
+            from gevent.pywsgi import WSGIServer
+        except ImportError:
+            from gevent.wsgi import WSGIServer
 
 
         if os.name == 'posix':