Bump NGitLab from 8.3.0 to 8.4.0 in /src#696

dependabot[bot] wants to merge 1 commit intodevelopGitTools/GitReleaseManager:developfrom

dependabot/nuget/src/NGitLab-8.4.0GitTools/GitReleaseManager:dependabot/nuget/src/NGitLab-8.4.0Copy head branch name to clipboard