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/oauth2webclient-webflux/src/main/java/sample/config/SecurityConfig.java

@@ -35,7 +35,7 @@ public class SecurityConfig {
 	@Bean
 	SecurityWebFilterChain configure(ServerHttpSecurity http) {
 		http
-			.authorizeExchange(exchanges ->
+			.authorizeExchange((exchanges) -> 
 				exchanges
 					.pathMatchers("/", "/public/**").permitAll()
 					.anyExchange().authenticated()