Add secret manager to spring-cloud-gcp dependency versions (#2187)
Add secret manager to spring-cloud-gcp dependency versions (#2187)

Add the secret manager starter to the spring-cloud-gcp dependency management.
spring-cloud/spring-cloud-gcp,spring-cloud/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,spring-cloud/spring-cloud-gcp,GoogleCloudPlatform/spring-cloud-gcp,spring-cloud/spring-cloud-gcp