Merge pull request #133 from woody35545/bugfix/user-pk-type

fix: resolve issue #131 by fixing primary key type for user entity

src/main/java/org/springframework/samples/petclinic/repository/springdatajpa/SpringDataUserRepository.java

@@ -6,6 +6,6 @@
 import org.springframework.samples.petclinic.repository.UserRepository;
 
 @Profile("spring-data-jpa")
-public interface SpringDataUserRepository extends UserRepository, Repository<User, Integer>  {
+public interface SpringDataUserRepository extends UserRepository, Repository<User, String>  {
 
 }