Add whitespace after copyright header

Add an additional lines after the copyright header and before the
`package` declaration. This aligns with the style used by Spring
Framework.

Issue gh-8945

itest/context/src/integration-test/java/org/springframework/security/integration/HttpNamespaceWithMultipleInterceptorsTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 import javax.servlet.http.HttpSession;

itest/context/src/integration-test/java/org/springframework/security/integration/HttpPathParameterStrippingTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 import javax.servlet.http.HttpSession;

itest/context/src/integration-test/java/org/springframework/security/integration/MultiAnnotationTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 import org.junit.After;

itest/context/src/integration-test/java/org/springframework/security/integration/SEC933ApplicationContextTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 import org.junit.Test;

itest/context/src/integration-test/java/org/springframework/security/integration/SEC936ApplicationContextTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 import org.junit.Test;

itest/context/src/integration-test/java/org/springframework/security/integration/StubUserRepository.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration;
 
 public class StubUserRepository implements UserRepository {

itest/context/src/integration-test/java/org/springframework/security/integration/python/PythonInterpreterBasedSecurityTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.integration.python;
 
 import org.junit.Test;

itest/context/src/integration-test/java/org/springframework/security/performance/FilterChainPerformanceTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.performance;
 
 import java.util.Arrays;

itest/context/src/integration-test/java/org/springframework/security/performance/ProtectPointcutPerformanceTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.performance;
 
 import org.junit.Before;