fix spec: Use a hash for a positoinal argument rather than keywords

[nekketsuuu]

With Ruby >= 3.0 and rspec-mocks gem >= 3.10.3, some test cases fail due to improper use of keyword arguments. This patch fixes it and ensures the success of those test cases.

Failure example:

1) BarbequeClient::Client#create_execution when barbeque is alive enqueues a job to barbeque
   Failure/Error: result = garage_client.post('/v2/job_executions', params)
     #<InstanceDouble(GarageClient::Client) (anonymous)> received :post with unexpected arguments
       expected: ("/v2/job_executions", {:application=>"cookpad", :delay_seconds=>nil, :job=>"NotifyAuthor", :message=>{:user_id=>1}, :queue=>"main"}) (keyword arguments)
            got: ("/v2/job_executions", {:application=>"cookpad", :delay_seconds=>nil, :job=>"NotifyAuthor", :message=>{:user_id=>1}, :queue=>"main"}) (options hash)
   # ./lib/barbeque_client/client.rb:27:in `create_execution'
   # ./spec/barbeque/client_spec.rb:28:in `block (4 levels) in <top (required)>'
   # ./spec/spec_helper.rb:12:in `block (2 levels) in <top (required)>'

References:

https://github.com/cookpad/garage_client/blob/af78afb3505c449d57734dede3b946e708ad31be/lib/garage_client/request.rb#L13
https://github.com/rspec/rspec-mocks/blob/103475e20b0e77df866f9c0574f360337f90aaec/Changelog.md#3103--2022-01-28

@cookpad/infra Would you please review this?

[nekketsuuu]

Thanks!