Fix javaconfig-rest sample dependency

Author: marcusdacoregio

spring-session-samples/spring-session-sample-javaconfig-rest/spring-session-sample-javaconfig-rest.gradle

@@ -16,7 +16,7 @@ dependencies {
 	implementation "ch.qos.logback:logback-classic"
 	implementation "org.testcontainers:testcontainers"
 
-	providedCompile "jakarta.servlet:jakarta.servlet-api"
+	providedCompile "jakarta.servlet:jakarta.servlet-api:6.0.0"
 
 	testImplementation "org.springframework.security:spring-security-test"
 	testImplementation "org.assertj:assertj-core"