Updates boot version to 3.4.0-M3

Author: spencergibb

docs/modules/ROOT/pages/index.adoc

@@ -1,6 +1,6 @@
 = Spring Cloud Train Reference Documentation
 
-:spring-boot-version: 3.4.0-M2
+:spring-boot-version: 3.4.0-M3
 
 Spring Cloud provides tools for developers to quickly build some of
 the common patterns in distributed systems (e.g. configuration

spring-cloud-starter-parent/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.4.0-M2</version>
+		<version>3.4.0-M3</version>
 		<relativePath/>
 	</parent>
 	<groupId>org.springframework.cloud</groupId>