Update dependency io.mockk:mockk to v1.12.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.mockk:mockk (source)	1.12.0 -> 1.12.1

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Release Notes

mockk/mockk

v1.12.1

• Fixed #​565, thanks @​AlexKrupa
• Reorganized tests to reflect the real feature they test rather than the number of the GitHub issue, thanks @​drazen04, @​fejd, @​polarene
• Converted most of the build.gradle files to kotlin, thanks @​geekiyer, @​vasanthdharmaraj, @​fejd, @​DeKaN
• Fixed a wrong behavior with unmockkAll inside the MockKExtension, thanks @​gmazzo
• Improved support for verification stack traces, thanks @​kkurczewski

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