Update kotlin monorepo to v1.8.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin:kotlin-compiler (source)	1.8.20 -> 1.8.21
org.jetbrains.kotlin:kotlin-stdlib-jdk8 (source)	1.8.20 -> 1.8.21
org.jetbrains.kotlin:kotlin-maven-plugin (source)	1.8.20 -> 1.8.21

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Release Notes

JetBrains/kotlin

v1.8.21

Compare Source

Compiler

• KT-57848 Native: compilation of dynamic/static library fails with Xcode 14.3
• KT-57875 Native compilation failure: Suspend functions should be lowered out at this point, but FUN LOCAL_FUNCTION_FOR_LAMBDA
• KT-57946 KAPT: "RuntimeException: No type for expression" with delegate

JavaScript

• KT-57356 KJS: StackOverflowException on @​JsExport with type parameters referring to one another

Tools. Compiler plugins. Serialization

• KT-58067 Serialization: NullPointerException caused by @​Contextual property with type with generic
• KT-57730 Serialization: "IllegalStateException: Serializer for element of type .Foo has not been found" caused by serialization of Java type

Tools. Gradle. JS

• KT-57766 KJS / Gradle "Module not found: Error: Can't resolve 'kotlin-kotlin-stdlib-js-ir'" when using "useEsModules"

Tools. Kapt

• KT-58027 Kotlin 1.8.20 kapt issue "null: KtCallExpression: build()"

Tools. Maven

• KT-58048 Maven: "Too many source module declarations found" after upgrading to 1.8.20
• KT-58101 'Unable to access class' in kotlin-maven-plugin after updating to Kotlin 1.8.20

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[coveralls]

Coverage: 100.0%. Remained the same when pulling 1614621 on renovate/kotlin-monorepo into cd1fbdb on master.