Add curly brackets to fix the matcher in ruby 3

What does this MR do and why?

This spec fails in Ruby 3 due to the way rspec-mocks handles hash vs kwargs matching.

Similar to !86157 (merged), see this MR for more context

How to set up and validate locally

Run the spec in both Ruby 2.7.5 (regular way) and Ruby 3.0.3, both should pass

You can run specs in ruby 3 by:

• Changing .ruby-version to 3.0.3
• Executing asdf local ruby 3.0.3
• Run the spec

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.