Update dependency io.mockk:mockk to v1.12.4

This MR contains the following updates:

Package	Update	Change
io.mockk:mockk (source)	patch	1.12.3 -> 1.12.4

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Release Notes

mockk/mockk

v1.12.4

Compare Source

• Add a Junit 4 rule, thanks @​jonapoul
• Recognize atLeast = 0, thanks @​uyw4687
• Revert the latest change about logging messages in withArg calls as it seems community usage was being impacted by the change, thanks @​romrell4 for the revert
• Added the @​ConfirmVerification extension, fixes #​215, #​334 and related issues
• Add languageVersion = 1.4 and the kotlin binary compatibility validator plugin
• Upgrade Objenesis to 3.2

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