Update dependency io.mockk:mockk to v1.12.3

This MR contains the following updates:

Package	Update	Change
io.mockk:mockk (source)	patch	1.12.2 -> 1.12.3

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Release Notes

mockk/mockk

v1.12.3

Compare Source

• Fixed #​707 via #​776, thanks @​romrell4
• Fixed #​754 fia #​782, thanks @​hoisie
• Fixed #​425 via #​785, thanks @​npars
• Added Quarkus support, thanks @​glefloch
• Updated logback to 1.2.10, thanks @​Neustradamus
• Converted some more build.gradle files to kotlin and bumped some JDK and kotlin versions

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