Fix kwargs issues in specs

What does this MR do and why?

Extracted from !85809 (closed).

These turn into failures if we:

• Use Ruby 3
• Update rspec-mocks to 3.10.3 (which we'll eventually do. in fact, we'll need it for Ruby 3 - compatibility checks)

The plan is:

1. To merge this MR to master
2. Make sure !85809 (closed) is green, merge all what is left into master as well
3. Bump rspec-mocks in master

Following such order shouldn't interrupt the work on #340298 (closed)

How to set up and validate locally

Tests-only change. We need to make sure pipeline is green.

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