Ruby 3 Upgrade: Fix failing tests in modules/check_in/spec/request/v2/sessions_request_spec.rb

[holdenhinkle]

Referencing ticket department-of-veterans-affairs/va.gov-team#54796

Fix the following tests:

 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:2:1]" # L248
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:3:1]" # L278
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:4:1:1:2]" # L336
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:4:1:1:1]" # L327
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:4:1:2:3]" # L387
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:4:1:2:2]" # L374
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:4:1:2:1]" # L361
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:1:1]" # L227
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:5:2:1]" # L434
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:5:3:1]" # L450
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:2:5:1:1]" # L418
 rspec "./modules/check_in/spec/request/v2/sessions_request_spec.rb[1:1:3:1]" # L84

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'})).