fix(deps): update kotlin monorepo to v2.0.20

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin:kotlin-gradle-plugin (source)	`2.0.10` -> `2.0.20`
org.jetbrains.kotlin:kotlin-stdlib-jdk8 (source)	`2.0.10` -> `2.0.20`

JetBrains/kotlin (org.jetbrains.kotlin:kotlin-gradle-plugin)

### [`v2.0.20`](https://togithub.com/JetBrains/kotlin/compare/v2.0.10...v2.0.20)

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micronaut-projects / micronaut-microstream