Mark applicable Scope's methods as default

Signed-off-by: Yanming Zhou <zhouyanming@gmail.com>

spring-web/src/main/java/org/springframework/web/context/request/RequestScope.java

@@ -16,8 +16,6 @@
 
 package org.springframework.web.context.request;
 
-import org.jspecify.annotations.Nullable;
-
 /**
  * Request-backed {@link org.springframework.beans.factory.config.Scope}
  * implementation.
@@ -44,13 +42,4 @@ public class RequestScope extends AbstractRequestAttributesScope {
 		return RequestAttributes.SCOPE_REQUEST;
 	}
 
-	/**
-	 * There is no conversation id concept for a request, so this method
-	 * returns {@code null}.
-	 */
-	@Override
-	public @Nullable String getConversationId() {
-		return null;
-	}
-
 }

spring-web/src/main/java/org/springframework/web/context/support/ServletContextScope.java

@@ -96,17 +96,6 @@ public class ServletContextScope implements Scope, DisposableBean {
 		}
 	}
 
-	@Override
-	public @Nullable Object resolveContextualObject(String key) {
-		return null;
-	}
-
-	@Override
-	public @Nullable String getConversationId() {
-		return null;
-	}
-
-
 	/**
 	 * Invoke all registered destruction callbacks.
 	 * To be called on ServletContext shutdown.