Remove filtering for unsupported rubies

Author: pirj

lib/rspec/support/spec/shell_out.rb

@@ -45,8 +45,6 @@ def run_ruby_with_current_load_path(ruby_command, *flags)
           %r{jruby-\d\.\d\.\d+\.\d/lib/ruby/stdlib/rubygems},
           # This is required for windows for some reason
           %r{lib/bundler/rubygems},
-          # This is a JRuby file that generates warnings on 9.0.3.0
-          %r{lib/ruby/stdlib/jar},
           # This is a JRuby file that generates warnings on 9.1.7.0
           %r{org/jruby/RubyKernel\.java},
           # This is a JRuby gem that generates warnings on 9.1.7.0