Consistently declare Object::equals argument as @Nullable

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -2821,7 +2821,7 @@ class DefaultListableBeanFactoryTests {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}

spring-beans/src/test/java/org/springframework/beans/support/PagedListHolderTests.java

@@ -22,6 +22,7 @@ import java.util.List;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.lang.Nullable;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -194,7 +195,7 @@ public class PagedListHolderTests {
 		}
 
 		@Override
-		public boolean equals(Object o) {
+		public boolean equals(@Nullable Object o) {
 			if (this == o) {
 				return true;
 			}