Deprecation warning when deploying to CloudFoundry

[mraible]

Overview of the issue

When deploying to CloudFoundry, there's a deprecation warning:

Deprecation warning: Specifying app manifest attributes at the top level is deprecated. Found: buildpack, instances, path, services.
Please see http://docs.cloudfoundry.org/devguide/deploy-apps/manifest.html#deprecated for alternatives and other app manifest deprecations. This feature will be removed in the future.

Motivation for or Use Case

Deploying to Cloud Foundry should work without errors.

Reproduce the error

Create an app with PostgreSQL and deploy to Cloud Foundry using heroku cloudfoundry.

My .yo-rc.json:

{
  "generator-jhipster": {
    "promptValues": {
      "packageName": "com.mycompany.myapp",
      "nativeLanguage": "en"
    },
    "jhipsterVersion": "6.8.0",
    "applicationType": "monolith",
    "baseName": "gradlepost",
    "packageName": "com.mycompany.myapp",
    "packageFolder": "com/mycompany/myapp",
    "serverPort": "8080",
    "authenticationType": "oauth2",
    "cacheProvider": "ehcache",
    "enableHibernateCache": true,
    "websocket": false,
    "databaseType": "sql",
    "devDatabaseType": "h2Disk",
    "prodDatabaseType": "postgresql",
    "searchEngine": false,
    "messageBroker": false,
    "serviceDiscoveryType": false,
    "buildTool": "gradle",
    "enableSwaggerCodegen": false,
    "embeddableLaunchScript": false,
    "useSass": true,
    "clientPackageManager": "npm",
    "clientFramework": "angularX",
    "clientTheme": "none",
    "clientThemeVariant": "",
    "creationTimestamp": 1588636387176,
    "testFrameworks": [],
    "jhiPrefix": "jhi",
    "entitySuffix": "",
    "dtoSuffix": "DTO",
    "otherModules": [],
    "enableTranslation": true,
    "nativeLanguage": "en",
    "languages": ["en"],
    "blueprints": []
  }
}

The generated manifest.yml:

---
path: .
instances: 1
buildpack: https://github.com/cloudfoundry/java-buildpack
services:
  - gradlepost
applications:
  - name: gradlepost
    env:
      SPRING_PROFILES_ACTIVE: prod, cloudfoundry

[atomfrede]

Is it somehow related to #11685 ? I guess cloudfoundry is not maintained well right now.