license_finder does not respect bundler Gemfile config

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This was discovered at !69461 (comment 667629118) and here's a most recent failure: https://gitlab.com/gitlab-jh/gitlab/-/jobs/1560768053

In particular, this section probably didn't use bundler in a correct way: https://github.com/pivotal/LicenseFinder/blob/v6.0.0/lib/license_finder/package_managers/bundler.rb#L60-L64

We need to patch license_finder to fix that.

In order to test this, picking gitlab-jh/gitlab!76 (merged) and run bundle config set --local gemfile jh/Gemfile should reproduce it.

Related upstream issue:

• https://github.com/pivotal/LicenseFinder/issues/605
• https://github.com/pivotal/LicenseFinder/issues/838