Update development gem dependencies

[synthead]

These are the development dependencies:

timex_datalink_client/Gemfile

Lines 5 to 12 in 405e163

	group :development do
	gem "mdl", "~> 0.12.0"
	gem "rspec", "~> 3.12.0"
	gem "rubocop", "~> 1.54.1"
	gem "rubocop-github", "~> 0.20.0"
	gem "tzinfo", "~> 2.0.5"
	gem "yard-junk", "~> 0.0.9"
	end

With the Ruby 3.4.1 update in #332, there are multiple issues with old gems on the new Ruby version.

Let's update these gems to support Ruby 3.4.1 👍