Set -buildvcs=false in the Go dependency scanning

[emmahsax]

See why here: pivotal#1047

To test just the associated test files, I ran:

bundle exec rspec spec/lib/license_finder/package_managers/go_modules_spec.rb features/features/package_managers/go_modules_spec.rb

To make a new tag, I ran:

git tag v7.2.1d && git push --tag

To build a new version of the gem, I ran:

gem build license_finder.gemspec