Remove unnecessary lambda blocks

Remove lambda blocks that aren't needed and replace instead with a
simple expression.

Issue gh-8945

config/src/integration-test/java/org/springframework/security/config/annotation/rsocket/RSocketMessageHandlerITests.java

@@ -221,9 +221,9 @@ public class RSocketMessageHandlerITests {
 
 		@Bean
 		PayloadSocketAcceptorInterceptor rsocketInterceptor(RSocketSecurity rsocket) {
-			rsocket.authorizePayload((authorize) -> {
-				authorize.route("secure.*").authenticated().anyExchange().permitAll();
-			}).basicAuthentication(Customizer.withDefaults());
+			rsocket.authorizePayload(
+					(authorize) -> authorize.route("secure.*").authenticated().anyExchange().permitAll())
+					.basicAuthentication(Customizer.withDefaults());
 			return rsocket.build();
 		}
 
@@ -247,9 +247,8 @@ public class RSocketMessageHandlerITests {
 
 		@MessageMapping({ "secure.send", "send" })
 		Mono<Void> send(Mono<String> payload) {
-			return payload.doOnNext(this::add).then(Mono.fromRunnable(() -> {
-				doNotifyAll();
-			}));
+			return payload.doOnNext(this::add).then(Mono.fromRunnable(() -> doNotifyAll()));
+
 		}
 
 		private synchronized void doNotifyAll() {

config/src/test/java/org/springframework/security/config/web/server/HeaderSpecTests.java

@@ -336,12 +336,10 @@ public class HeaderSpecTests {
 	@Test
 	public void headersWhenCustomHeadersWriter() {
 		this.expectedHeaders.add(CUSTOM_HEADER, CUSTOM_VALUE);
-		this.http.headers((headers) -> headers.writer((exchange) -> {
-			return Mono.just(exchange).doOnNext((it) -> {
-				it.getResponse().getHeaders().add(CUSTOM_HEADER, CUSTOM_VALUE);
-			}).then();
+		this.http.headers((headers) -> headers.writer((exchange) -> Mono.just(exchange)
+				.doOnNext((it) -> it.getResponse().getHeaders().add(CUSTOM_HEADER, CUSTOM_VALUE)).then()
 
-		}));
+		));
 
 		assertHeaders();
 	}

config/src/test/java/org/springframework/security/htmlunit/server/HtmlUnitWebTestClient.java

@@ -186,9 +186,7 @@ final class HtmlUnitWebTestClient {
 		}
 
 		private ClientRequest withClientCookies(ClientRequest request) {
-			return ClientRequest.from(request).cookies((c) -> {
-				c.addAll(clientCookies());
-			}).build();
+			return ClientRequest.from(request).cookies((c) -> c.addAll(clientCookies())).build();
 		}
 
 		private MultiValueMap<String, String> clientCookies() {