Update the opensearch-rails gem (RM-2427).

- Make logger formatter for opensearch-rails nil safe. It seems that sometimes
  a message (`m`) is `nil`.

opensearch-rails/spec/spec_helper.rb

@@ -34,7 +34,7 @@
   config.before(:suite) do
     require 'ansi'
     tracer = ::Logger.new(STDERR)
-    tracer.formatter = lambda { |s, d, p, m| "#{m.gsub(/^.*$/) { |n| '   ' + n }.ansi(:faint)}\n" }
+    tracer.formatter = lambda { |s, d, p, m| "#{m&.gsub(/^.*$/) { |n| '   ' + n }&.ansi(:faint)}\n" }
     OpenSearch::Model.client = OpenSearch::Client.new host: OPENSEARCH_URL,
                                                             tracer: (ENV['QUIET'] ? nil : tracer)
     puts "OpenSearch Version: #{OpenSearch::Model.client.info['version']}"