Remove unused imports in tests (GH-14518) (GH-14520)

(cherry picked from commit 8f4ef3b019ce380022018587571b0f970e668de3)
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index 66369fe..1898990 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -26,7 +26,7 @@
 
 ssl = support.import_module("ssl")
 
-from ssl import TLSVersion, _TLSContentType, _TLSMessageType, _TLSAlertType
+from ssl import TLSVersion, _TLSContentType, _TLSMessageType
 
 PROTOCOLS = sorted(ssl._PROTOCOL_NAMES)
 HOST = support.HOST
@@ -4592,7 +4592,6 @@
 
 def test_main(verbose=False):
     if support.verbose:
-        import warnings
         plats = {
             'Mac': platform.mac_ver,
             'Windows': platform.win32_ver,