fix: use specific version of concurrent-ruby gem

According to [this stackoverflow post](https://stackoverflow.com/a/79361034) by using the 1.3.4 version
of concurrent-ruby gem, this should fix our logging issues.

Signed-off-by: jmeridth <jmeridth@gmail.com>

Author: jmeridth

Gemfile

@@ -5,6 +5,7 @@ gemspec
 rails_version = ENV["RAILS_VERSION"] == "edge" ? { github: "rails/rails" } : ENV["RAILS_VERSION"]
 gem "actionpack", rails_version
 gem "activesupport", rails_version
+gem "concurrent-ruby", "1.3.4"
 
 graphql_version = ENV["GRAPHQL_VERSION"] == "edge" ? { github: "rmosolgo/graphql-ruby", ref: "interpreter-without-legacy" } : ENV["GRAPHQL_VERSION"]
 gem "graphql", graphql_version