Concourse extension doesn't know about "depth" for a semver resource

[guillaumBrisard]

depth is not recognize for semver resource with git driver

The extension wrongly reports

Unknown property 'depth' for type 'GitSemverSource'vscode-concourse(YamlSchemaProblem)`

The documentation about depth for resource: https://github.com/concourse/semver-resource#git-driver