Update kotest to v5.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
io.kotest.multiplatform	5.5.5 -> 5.6.1
io.kotest:kotest-runner-junit5	5.5.5 -> 5.6.1
io.kotest:kotest-framework-engine	5.5.5 -> 5.6.1
io.kotest:kotest-assertions-core	5.5.5 -> 5.6.1

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