Remove outdated Python pre-3.7 references (datastax#1186)

Author: bschoening

test-requirements.txt

@@ -5,13 +5,12 @@ mock>1.1
 pytz
 sure
 pure-sasl
-twisted[tls]; python_version >= '3.5'
-twisted[tls]==19.2.1; python_version < '3.5'
+twisted[tls]
 gevent>=1.0; python_version < '3.13' and platform_machine != 'i686' and platform_machine != 'win32'
 gevent==23.9.0; python_version < '3.13' and (platform_machine == 'i686' or platform_machine == 'win32')
 eventlet>=0.33.3; python_version < '3.13'
-cython
+cython>=0.20,<0.30
 packaging
 futurist; python_version >= '3.7'
-asynctest; python_version >= '3.5'
+asynctest
 pyyaml

tests/integration/long/test_ssl.py

@@ -28,7 +28,7 @@
 
 if not hasattr(ssl, 'match_hostname'):
     try:
-        from backports.ssl_match_hostname import match_hostname
+        from ssl import match_hostname
         ssl.match_hostname = match_hostname
     except ImportError:
         pass  # tests will fail