Deprecation message on `@octokit/rest` while rebooting the app

[boubkerbribri]

After failing the weekend, it was resolved by rebooting the app.
While rebooting, this message is displayed.

14:35:10.194Z  INFO probot: Listening on http://localhost:3000/
{ Deprecation: [@octokit/rest] Setting the "new Octokit({ auth })" option to an object without also setting the "authStrategy" option is deprecated and will be removed in v17. See (https://octokit.github.io/rest.js/#authentication)
    at authenticationPlugin (/app/node_modules/@octokit/rest/plugins/authentication/index.js:58:5)
    at Octokit.plugins.forEach.pluginFunction (/app/node_modules/@octokit/rest/lib/constructor.js:26:37)
    at Array.forEach (<anonymous>)
    at new Octokit (/app/node_modules/@octokit/rest/lib/constructor.js:26:11)
    at Object.GitHubAPI (/app/node_modules/probot/lib/github/index.js:21:19)
    at cache.wrap.ttl (/app/node_modules/probot/lib/application.js:231:102)
    at process._tickCallback (internal/process/next_tick.js:68:7) name: 'Deprecation' }