fix ruby2.7 kwargs warning with finders method_missing

[shanet]

Description

Warnings generated by Ruby 2.7 regarding kwargs were fixed with this patch: #885. However, I ran into a lingering one generated by the Finders module method_missing method. Adding ruby2_keywords to the function header as was done with the other method_missing methods from the aforementioned patch resolves the warning.

References

• Fix kwargs for Ruby 2.7 #885
• https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/

[shanet]

Closing this to get it off my open PRs list since it seems this gem is no longer maintained.