Remove deprecated dependencies

[bbenoist]

$ npm install --global-style --no-bin-links --no-optional verdaccio-gitlab
npm WARN deprecated gitlab@3.5.1: The gitlab package has found a new home in the @gitbeaker organization. For the latest gitlab node library, check out @gitbeaker/node. A full list of the features can be found here: https://github.com/jdalrymple/gitbeaker#readme
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated request-promise@4.2.6: request-promise has been deprecated because it extends the now deprecated request package, see https://github.com/request/request/issues/3142
npm WARN deprecated har-validator@5.1.5: this library is no longer supported
npm WARN deprecated request@2.88.0: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN deprecated request-promise-native@1.0.9: request-promise-native has been deprecated because it extends the now deprecated request package, see https://github.com/request/request/issues/3142