Update spec/gitlab_mr_release/project_spec.rb
Update spec/gitlab_mr_release/project_spec.rb

refine test codes

Co-Authored-By: GO Sueyoshi <11da0f3227ffefa05b8533b1fb20015a2cdf16e6@users.noreply.github.com>
sue445/gitlab_mr_release,sue445/gitlab_mr_release,sue445/gitlab_mr_release