Add missing actuator dep

Due to removal of Spring Boot admin package

Author: Brutus5000

build.gradle

@@ -224,6 +224,7 @@ dependencies {
   implementation("org.springframework.boot:spring-boot-starter-thymeleaf")
   implementation("org.springframework.boot:spring-boot-starter-mail")
   implementation("org.springframework.boot:spring-boot-starter-validation")
+  implementation("org.springframework.boot:spring-boot-starter-actuator")
   implementation("io.micrometer:micrometer-core")
   implementation("com.github.ben-manes.caffeine:caffeine")