Handle rspec-mocks 3.10.3 change with "with" syntax

[mtasaka]

rspec-mocks 3.10.3 changed "with" syntax behavior to support ruby 3 keyword arguments separation:

https://github.com/rspec/rspec-mocks/pull/1394 https://github.com/rspec/rspec-mocks/issues/1460

Fix yard testsuite accordingly.

Fixes #1432

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