Upgrade Spring Boot in sample

Author: dsyer

samples/grpc-tomcat/pom.xml

@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.3.3</version>
+		<version>3.4.0</version>
 		<relativePath /> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>org.springframework.grpc</groupId>