Add 'tzinfo-data' for Windows development (#5979)

* This is needed to run Mongoid tests (and any Rails gem test) on Windows. Rails adds it automatically when you do rails new on windows. Since it is in the Gemfile (not the gemspec) it doesn't affect anyone's actual code, it is purely for development purposes.

* Update Gemfile

Co-authored-by: Alex Bevilacqua <alex@alexbevi.com>

---------

Co-authored-by: Alex Bevilacqua <alex@alexbevi.com>

Author: johnnyshields

Gemfile

@@ -17,3 +17,6 @@ if RUBY_PLATFORM =~ /java/
 end
 
 gem 'i18n', *i18n_versions
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem "tzinfo-data", platforms: %i[ windows jruby ]