bpo-9216: hashlib usedforsecurity fixes (GH-20258)



func:`hashlib.new` passed ``usedforsecurity`` to OpenSSL EVP constructor
``_hashlib.new()``. test_hashlib and test_smtplib handle strict security
policy better.

Signed-off-by: Christian Heimes <christian@python.org>

Automerge-Triggered-By: @tiran
diff --git a/Lib/test/test_smtplib.py b/Lib/test/test_smtplib.py
index c1bd2e2..5762999 100644
--- a/Lib/test/test_smtplib.py
+++ b/Lib/test/test_smtplib.py
@@ -1067,6 +1067,7 @@
         self.assertEqual(resp, (235, b'Authentication Succeeded'))
         smtp.close()
 
+    @hashlib_helper.requires_hashdigest('md5')
     def testAUTH_multiple(self):
         # Test that multiple authentication methods are tried.
         self.serv.add_feature("AUTH BOGUS PLAIN LOGIN CRAM-MD5")