Fix actual/expected pattern (deprecated in K2)

[NGrech]

[Whathecode]

@NGrech Can you link to documentation on what this is about? As part of upgrading to Kotlin 2.1 I did not run into any such deprecation notice.

Searching official documentation, I can't easily find anything either. It's still clearly documented in the latest version. If this was a mistake, please close it. :)