python3: bump gevent version

ligurio · ligurio · commit 38890e0016e1 · 2021-01-27T17:23:31.000+03:00
Python module gevent-1.1b5 is incompatible with Mac OS X 15 [1]. 1. https://gitlab.com/tarantool/tarantool/-/jobs/971623156
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 PyYAML==5.1
 argparse==1.1
 msgpack-python==0.4.6
-gevent==1.1b5
+gevent==21.1.1
 six>=1.8.0
