Fix use of Ruby 2.5+ syntax

any? doesn't take a Regexp on most of our supported versions

lib/bugsnag/middleware/ignore_error_class.rb

@@ -17,7 +17,7 @@ def call(report)
           when Proc then to_ignore.call(ex)
           when Class then ancestor_chain.include?(to_ignore)
           when String then ancestor_chain_strings.include?(to_ignore)
-          when Regexp then ancestor_chain_strings.any?(to_ignore)
+          when Regexp then ancestor_chain_strings.any? { |ancestor| to_ignore =~ ancestor }
           else false
           end
         end