refactor: Remove unused MfaDeleteAuthenticatorError import from mfa_client and test files

Author: subhankarmaiti

src/auth0_server_python/auth_server/mfa_client.py

@@ -21,7 +21,6 @@
 from auth0_server_python.encryption.encrypt import decrypt, encrypt
 from auth0_server_python.error import (
     MfaChallengeError,
-    MfaDeleteAuthenticatorError,
     MfaEnrollmentError,
     MfaListAuthenticatorsError,
     MfaRequiredError,
@@ -415,9 +414,10 @@ async def _persist_mfa_tokens(
                 - 'scope': str (optional) - Scope for token_set
                 - 'store_options': dict (optional) - Store-specific options
         """
-        from auth0_server_python.auth_types import TokenSet, StateData
         import time
 
+        from auth0_server_python.auth_types import StateData, TokenSet
+
         audience = options.get("audience")
         scope = options.get("scope")
         store_options = options.get("store_options")

src/auth0_server_python/tests/test_mfa_client.py

@@ -16,7 +16,6 @@
 )
 from auth0_server_python.error import (
     MfaChallengeError,
-    MfaDeleteAuthenticatorError,
     MfaEnrollmentError,
     MfaListAuthenticatorsError,
     MfaRequiredError,