GH-111 - Optionally depend on Spring Boot autoconfiguration to keep Javadoc happy.

ModulithMetadata refers to SpringBootApplication in its Javadoc, which requires us to have the JAR on the classpath for Javadoc creation as the linting otherwise fails.

spring-modulith-core/pom.xml

@@ -41,6 +41,12 @@
 			<artifactId>spring-core</artifactId>
 		</dependency>
 
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-autoconfigure</artifactId>
+			<optional>true</optional>
+		</dependency>
+
 		<dependency>
 			<groupId>org.springframework.data</groupId>
 			<artifactId>spring-data-commons</artifactId>