Use parenthesis with single-arg lambdas

Use regular expression search/replace to ensure all single-arg
lambdas have parenthesis. This aligns with the style used in Spring
Boot and ensure that single-arg and multi-arg lambdas are consistent.

Issue gh-8945

samples/boot/hellorsocket/src/integration-test/java/sample/HelloRSocketApplicationITests.java

@@ -53,7 +53,7 @@ public class HelloRSocketApplicationITests {
 	public void messageWhenAuthenticatedThenSuccess() {
 		UsernamePasswordMetadata credentials = new UsernamePasswordMetadata("user", "password");
 		RSocketRequester requester = this.requester
-				.rsocketStrategies(builder -> builder.encoder(new BasicAuthenticationEncoder()))
+				.rsocketStrategies((builder) -> builder.encoder(new BasicAuthenticationEncoder()))
 				.setupMetadata(credentials, BASIC_AUTHENTICATION_MIME_TYPE)
 				.connectTcp("localhost", this.port)
 				.block();