Use Spring Boot 4.0.3-SNAPSHOT

Author: ryanjbaxter

docs/modules/ROOT/pages/index.adoc

@@ -1,6 +1,6 @@
 = Spring Cloud Train Reference Documentation
 
-:spring-boot-version: 4.0.2-SNAPSHOT
+:spring-boot-version: 4.0.3-SNAPSHOT
 
 Spring Cloud provides tools for developers to quickly build some of
 the common patterns in distributed systems (e.g. configuration

spring-cloud-dependencies/pom.xml

@@ -17,7 +17,7 @@
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
 		<!-- boot version used in docs generation, previously from starter-parent -->
-		<spring-boot.version>4.0.2</spring-boot.version>
+		<spring-boot.version>4.0.3-SNAPSHOT</spring-boot.version>
 		<spring-cloud-bus.version>5.0.2-SNAPSHOT</spring-cloud-bus.version>
 		<spring-cloud-build.version>5.0.2-SNAPSHOT</spring-cloud-build.version>
 		<spring-cloud-commons.version>5.0.2-SNAPSHOT</spring-cloud-commons.version>