GH-786 Fix regression with RoutingFunction over AWS APIGateway

Resolves #786

spring-cloud-function-samples/function-sample-aws-routing/pom.xml

@@ -33,6 +33,10 @@
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-function-adapter-aws</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-web</artifactId>
+		</dependency>
 
 		<dependency>
 			<groupId>com.amazonaws</groupId>