Revert "add python 3.11 tests (#722)"

This reverts commit c0972d2.

coverage.py still has issues with Python 3.11, there's not much point in keeping them if they segfault half the time.
nedbat/coveragepy#1316

.github/workflows/ci.yml

@@ -26,7 +26,7 @@ jobs:
           - '3.8'
           - '3.9'
           - '3.10'
-          - '3.11-dev'
+          # - '3.11.0-alpha.4'
         db:
           - [mysql, '5.7']
           - [mysql, '8.0']

requirements-dev.txt

@@ -8,5 +8,5 @@ PyMySQL>=1.0.0,<=1.0.2
 sphinx>=1.8.1, <4.4.1
 sphinxcontrib-asyncio==0.3.0
 sqlalchemy>1.2.12,<=1.3.16
-uvloop==0.16.0; python_version < '3.11'
+uvloop==0.16.0
 pyroma==3.2

tests/conftest.py

@@ -3,21 +3,11 @@
 import os
 import re
 import ssl
-import sys
 
 import aiomysql
 import pymysql
 import pytest
-
-
-# version gate can be removed once uvloop supports python 3.11
-# https://github.com/MagicStack/uvloop/issues/450
-# https://github.com/MagicStack/uvloop/pull/459
-PY_311 = sys.version_info >= (3, 11)
-if PY_311:
-    uvloop = None
-else:
-    import uvloop
+import uvloop
 
 
 @pytest.fixture