gevent fails to build with Cython 3.0.10.  As per
https://github.com/gevent/gevent/issues/2031, removing the
cython.final decorator works around this.

Upstream-Status: Pending
Signed-off-by: Ross Burton <ross.burton@arm.com>

--- a/src/gevent/_gevent_cqueue.pxd
+++ b/src/gevent/_gevent_cqueue.pxd
@@ -75,7 +75,6 @@ cdef class ItemWaiter(Waiter):
     cdef readonly Queue queue
 
 
-@cython.final
 cdef class UnboundQueue(Queue):
     pass