Update Kotlin/Jupyter to v0.12.0-270

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.jupyter.api	0.12.0-259 -> 0.12.0-270
org.jetbrains.kotlinx:kotlin-jupyter-test-kit	0.12.0-259 -> 0.12.0-270
org.jetbrains.kotlinx:kotlin-jupyter-api	0.12.0-259 -> 0.12.0-270

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