Annotate Object#equals parameter with @Nullable

Closes gh-23093

spring-expression/src/main/java/org/springframework/expression/TypedValue.java

@@ -81,7 +81,7 @@ public class TypedValue {
 
 
 	@Override
-	public boolean equals(Object other) {
+	public boolean equals(@Nullable Object other) {
 		if (this == other) {
 			return true;
 		}

spring-expression/src/main/java/org/springframework/expression/spel/support/ReflectivePropertyAccessor.java

@@ -596,7 +596,7 @@ public class ReflectivePropertyAccessor implements PropertyAccessor {
 		}
 
 		@Override
-		public boolean equals(Object other) {
+		public boolean equals(@Nullable Object other) {
 			if (this == other) {
 				return true;
 			}