DATAJPA-1336 - Removes unused imports.

Original pull request: #273.

src/main/java/org/springframework/data/jpa/domain/Specifications.java

@@ -25,7 +25,6 @@ import javax.persistence.criteria.Predicate;
 import javax.persistence.criteria.Root;
 
 import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
 
 /**
  * Helper class to easily combine {@link Specification} instances.

src/test/java/org/springframework/data/jpa/repository/UserRepositoryTests.java

@@ -60,7 +60,6 @@ import org.springframework.data.domain.Slice;
 import org.springframework.data.domain.Sort;
 import org.springframework.data.domain.Sort.Direction;
 import org.springframework.data.domain.Sort.Order;
-import org.springframework.data.domain.ExampleMatcher.*;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.data.jpa.domain.sample.Address;
 import org.springframework.data.jpa.domain.sample.Role;

src/test/java/org/springframework/data/jpa/repository/query/ParameterBinderUnitTests.java

@@ -17,7 +17,6 @@ package org.springframework.data.jpa.repository.query;
 
 import static java.util.Collections.*;
 import static javax.persistence.TemporalType.*;
-import static org.mockito.ArgumentMatchers.anyObject;
 import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.*;