increment deprecation for the 2.2 release cycle (#3961)

diff --git a/src/cryptography/utils.py b/src/cryptography/utils.py
index 02857c0..986b504 100644
--- a/src/cryptography/utils.py
+++ b/src/cryptography/utils.py
@@ -15,8 +15,7 @@
 # ubiquity of their use. They should not be removed until we agree on when that
 # cycle ends.
 PersistentlyDeprecated = DeprecationWarning
-DeprecatedIn19 = DeprecationWarning
-DeprecatedIn21 = PendingDeprecationWarning
+DeprecatedIn21 = DeprecationWarning
 
 
 def _check_bytes(name, value):