Merge remote-tracking branch 'origin/20.12LTS' into tox_requires_2012

setup.py

@@ -80,7 +80,7 @@ def open_local(paths, mode="r", encoding="utf8"):
     '; sys_platform != "win32" ' 'and implementation_name == "cpython"'
 )
 ujson = "ujson>=1.35" + env_dependency
-uvloop = "uvloop>=0.5.3" + env_dependency
+uvloop = "uvloop>=0.5.3,<0.15.0" + env_dependency
 
 requirements = [
     "httptools>=0.0.10",