Update Spring Boot 2.7.0 and Gradle 7.4.1

Swagger/demo/build.gradle

 plugins {
-    id 'org.springframework.boot' version '2.6.7'
+    id 'org.springframework.boot' version '2.7.0'
     id 'io.spring.dependency-management' version '1.0.11.RELEASE'
     id 'java'
 }
@@ -25,7 +25,7 @@ dependencies {
     annotationProcessor 'org.springframework.boot:spring-boot-configuration-processor'
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
-    implementation 'org.springdoc:springdoc-openapi-ui:1.6.8'
+    implementation 'org.springdoc:springdoc-openapi-ui:1.6.9'
 }
 
 tasks.named('test') {