Remove extra conditions in HWIDA since Rails 6 does not support Ruby 2.2

See https://github.com/ruby/ruby/blob/ruby_2_3/NEWS

activesupport/lib/active_support/hash_with_indifferent_access.rb

@@ -177,7 +177,6 @@ module ActiveSupport
       super(convert_key(key), *extras)
     end
 
-    if Hash.new.respond_to?(:dig)
     # Same as <tt>Hash#dig</tt> where the key passed as argument can be
     # either a string or a symbol:
     #
@@ -191,7 +190,6 @@ module ActiveSupport
       args[0] = convert_key(args[0]) if args.size > 0
       super(*args)
     end
-    end
 
     # Same as <tt>Hash#default</tt> where the key passed as argument can be
     # either a string or a symbol:
@@ -228,7 +226,7 @@ module ActiveSupport
     #   hash.fetch_values('a', 'c') # => KeyError: key not found: "c"
     def fetch_values(*indices, &block)
       indices.collect { |key| fetch(key, &block) }
-    end if Hash.method_defined?(:fetch_values)
+    end
 
     # Returns a shallow copy of the hash.
     #

activesupport/test/hash_with_indifferent_access_test.rb

@@ -169,8 +169,6 @@ class HashWithIndifferentAccessTest < ActiveSupport::TestCase
   end
 
   def test_indifferent_fetch_values
-    skip unless Hash.method_defined?(:fetch_values)
-
     @mixed = @mixed.with_indifferent_access
 
     assert_equal [1, 2], @mixed.fetch_values("a", "b")