Upgrade Spring Geode Samples parent Maven POM to Spring Boot 3.0.0-M2.

Author: jxblum

spring-geode-samples/pom.xml

@@ -8,7 +8,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.0.0-M1</version>
+		<version>3.0.0-M2</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>