Remove deprecated svr3Credentials field

service/src/main/java/org/whispersystems/textsecuregcm/auth/RegistrationLockVerificationManager.java

@@ -169,8 +169,7 @@ public class RegistrationLockVerificationManager {
       throw new WebApplicationException(Response.status(FAILURE_HTTP_STATUS)
           .entity(new RegistrationLockFailure(
               existingRegistrationLock.getTimeRemaining().toMillis(),
-              svr2FailureCredentials(existingRegistrationLock, updatedAccount),
-              null))
+              svr2FailureCredentials(existingRegistrationLock, updatedAccount)))
           .build());
     }
 

service/src/main/java/org/whispersystems/textsecuregcm/entities/RegistrationLockFailure.java

@@ -18,8 +18,5 @@ public record RegistrationLockFailure(
     long timeRemaining,
     @Schema(description = "Credentials that can be used with SVR2")
     @Nullable
-    ExternalServiceCredentials svr2Credentials,
-    @Deprecated
-    @Nullable
-    ExternalServiceCredentials svr3Credentials) {
+    ExternalServiceCredentials svr2Credentials) {
 }