fix: Ignore email and phone assertions when token hash is being verified

Author: sarvesh-dalvi-1

packages/gotrue/lib/src/gotrue_client.dart

@@ -533,7 +533,7 @@ class GoTrueClient {
     String? captchaToken,
     String? tokenHash,
   }) async {
-    assert((email != null && phone == null) || (email == null && phone != null),
+    assert(((email != null && phone == null) || (email == null && phone != null)) || (tokenHash != null),
         '`email` or `phone` needs to be specified.');
     assert(token != null || tokenHash != null,
         '`token` or `tokenHash` needs to be specified.');