fix: remove expiry_date from SoftwareSecurePhotoVerification

lms/djangoapps/verify_student/models.py

@@ -640,9 +640,6 @@ class SoftwareSecurePhotoVerification(PhotoVerification):
     IMAGE_LINK_DURATION = 5 * 60 * 60 * 24  # 5 days in seconds
     copy_id_photo_from = models.ForeignKey("self", null=True, blank=True, on_delete=models.CASCADE)
 
-    # DEPRECATED: the `expiry_date` field has been replaced by `expiration_date`
-    expiry_date = models.DateTimeField(null=True, blank=True, db_index=True)
-
     # This field is used to maintain a check for learners to which email
     # to notify for expired verification is already sent.
     expiry_email_date = models.DateTimeField(null=True, blank=True, db_index=True)