GH-1191 - Upgrade to Spring Boot 4 M1.

Author: odrotbohm

pom.xml

@@ -47,7 +47,7 @@
 		<nullaway.version>0.12.7</nullaway.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<spring-boot.version>4.0.0-SNAPSHOT</spring-boot.version>
+		<spring-boot.version>4.0.0-M1</spring-boot.version>
 		<spring-framework.version>7.0.0-SNAPSHOT</spring-framework.version> <!-- For Javadoc links only -->
 		<testcontainers.version>1.21.3</testcontainers.version>
 		<structurizr.version>4.1.0</structurizr.version>

spring-modulith-examples/pom.xml

@@ -4,7 +4,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>4.0.0-SNAPSHOT</version>
+		<version>4.0.0-M1</version>
 		<relativePath />
 	</parent>