Add "cryptography" kind to CredentialType (#12842)

This was missed when we landed #12813. Adds cryptography
kind to the CredentialType allowed kinds list, which now
produces the proper error message when attempting to PUT
to modify the managed credential type.

Signed-off-by: Rick Elrod <rick@elrod.me>

awx/main/models/credential/__init__.py

@@ -336,6 +336,7 @@ class CredentialType(CommonModelNameNotUnique):
         ('external', _('External')),
         ('kubernetes', _('Kubernetes')),
         ('galaxy', _('Galaxy/Automation Hub')),
+        ('cryptography', _('Cryptography')),
     )
 
     kind = models.CharField(max_length=32, choices=KIND_CHOICES)