🐛 fix CreateMergeRequestDependency and test
The gitlab api documentation on https://docs.gitlab.com/api/merge_requests/#create-a-merge-request-dependency is wrong. This mr should fix the api response type in the function CreateMergeRequestDependency. The documentation says, the response type is []MergeRequestDependency, but the actual api returns just a single MergeRequestDependency.
Edited by Lukas Lüdke