Fix checkstyle errors

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/jersey/JerseyWebEndpointIntegrationTests.java

@@ -142,7 +142,7 @@ public class JerseyWebEndpointIntegrationTests extends
 
 	private static class MockPrincipalWrapper extends HttpServletRequestWrapper {
 
-		public MockPrincipalWrapper(HttpServletRequest request) {
+		MockPrincipalWrapper(HttpServletRequest request) {
 			super(request);
 		}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/reactive/WebFluxEndpointIntegrationTests.java

@@ -164,7 +164,7 @@ public class WebFluxEndpointIntegrationTests
 	private static class MockPrincipalServerWebExchangeDecorator
 			extends ServerWebExchangeDecorator {
 
-		protected MockPrincipalServerWebExchangeDecorator(ServerWebExchange delegate) {
+		MockPrincipalServerWebExchangeDecorator(ServerWebExchange delegate) {
 			super(delegate);
 		}
 

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/endpoint/web/servlet/MvcWebEndpointIntegrationTests.java

@@ -156,7 +156,7 @@ public class MvcWebEndpointIntegrationTests extends
 
 	private static class MockPrincipalWrapper extends HttpServletRequestWrapper {
 
-		public MockPrincipalWrapper(HttpServletRequest request) {
+		MockPrincipalWrapper(HttpServletRequest request) {
 			super(request);
 		}