Revert "Add missing require"

There is a circular require going on and the warning breaks the build. Reverting
for now to get the fix the build.

This reverts commit dae24cc.

Author: fxn

activesupport/lib/active_support/core_ext/date_and_time/calculations.rb

@@ -1,7 +1,6 @@
 # frozen_string_literal: true
 
 require "active_support/core_ext/object/try"
-require "active_support/core_ext/time/calculations"
 require "active_support/core_ext/date_time/conversions"
 
 module DateAndTime