Ruby 3 KwArgs: Fix PreCheckInsRequest Spec

[ericboehs]

Ruby 2.7 deprecated automatic casting of a hash passed as the last argument of a method to keyword arguments. You must now use actual keyword arguments (foo(bar: 'baz') instead of foo({bar: 'baz'})) or cast the hash to keyword args using the double splat (foo(**{bar: 'baz'})).

In preparation for upgrading to Ruby 3.0, we're implementing the new syntax for V2::PreCheckInsController spec.

Fix test:

rspec "./modules/check_in/spec/request/v2/pre_check_ins_request_spec.rb"

Pulled from: department-of-veterans-affairs/va.gov-team#54796