Update dependency org.springframework.boot:spring-boot-starter-parent to v4

Author: renovate[bot]

challenge-01/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.6</version>
+		<version>4.0.0</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>dev.cbos.o11yc</groupId>

challenge-02/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>3.5.6</version>
+		<version>4.0.0</version>
 	</parent>
 	<groupId>dev.cbos.o11yc</groupId>
 	<artifactId>challenge-02</artifactId>