Update kotlin monorepo to v2.0.21

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin.plugin.serialization (source)	2.0.20 -> 2.0.21
org.jetbrains.kotlin.plugin.spring (source)	2.0.20 -> 2.0.21
org.jetbrains.kotlin.plugin.allopen (source)	2.0.20 -> 2.0.21
org.jetbrains.kotlin.jvm (source)	2.0.20 -> 2.0.21

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Release Notes

JetBrains/kotlin (org.jetbrains.kotlin.plugin.serialization)

v2.0.21

Apple Ecosystem

• KT-69093 Xcode 16 support in Kotlin

Backend. Native. Debug

• KT-71374 lldb: step out breaks breaking in Xcode 16

Compiler

Fixes

• KT-69735 K2: Static fields are missing from the declaration list of corresponding IrClass for java class
• KT-71122 Regression in Kotlin Compiler 2.0 causing NPE in the runtime
• KT-70931 K2 / Scripts: "cannot convert IrExpression to ConstantValue" when using function annotation
• KT-70584 K2: "IllegalStateException: flow for PostponedLambdaExitNode not initialized - traversing nodes in wrong order?"
• KT-70808 K2: "node has already been visited" with anonymous object in dead code
• KT-69985 K2: Classifier declarations from root package are resolved without imports in non-root packages
• KT-70683 K2: Internal compiler error in IrFakeOverrideSymbolBase.getOwner
• KT-70901 False positive Public-API inline function cannot access non-public-API property accessor
• KT-70930 K2: Java annotations not present on ENUM_ENTRY IR elements
• KT-70194 K2 IDE: exception on a very red file
• KT-69399 Native: IllegalStateException: "Failed to build cache"

Compose compiler

Fixes

• b/329477544 Force open / overridden Composable functions to be non-restartable.
• b/361652128 Disable live literal transform if the corresponding flag is disabled

IR. Actualizer

• KT-70894 IR crash. Unprocessed IrFunctionFakeOverrideSymbol when actualize to Java

IR. Tree

• KT-71191 SymbolTable: Check if the provided signature is public before adding a symbol to the SymbolTable

Native. Build Infrastructure

• KT-71485 K/N runtime parts don't build due to _Float16 issues on x86_64 macOS

Native. C Export

• KT-69507 LLVM 11 clang with Xcode 16 headers: standard c++ headers

Native. C and ObjC Import

• KT-71029 Investigate why stdarg.h declarations leak into testModuleA

Native. Platform Libraries

• KT-70566 LLVM 11 clang with Xcode 16 headers: 'sys/cdefs.h' file not found
• KT-71624 Eliminate remaining UIKit/AppKit removed signatures
• KT-70031 Rebuild platform libraries in 2.0.21 with Xcode 16

Native. Testing

• KT-70603 C++ with -fmodules: cyclic dependency in module 'std': std -> _wctype -> __wctype -> std in dev llvm toolchains

Tools. CLI. Native

• KT-71262 KotlinNativeLink tasks fetching from network despite -Xoverride-konan-properties=dependenciesUrl= being set

Tools. Compiler Plugins

• KT-71038 PowerAssert: Constant on RHS of elvis operator leads to compiler crash

Tools. Daemon

• KT-35381 Get rid of the native-platform usage in kotlin compiler

Tools. Gradle. Multiplatform

• KT-71444 Certain POMs produced by Kotlin 2.0.20 cannot be consumed by KMP projects with Android targets
• KT-70700 Gradle 8.10: The value for task ':commonizeNativeDistribution' property 'kotlinNativeBundleBuildService' cannot be changed any further
• KT-71396 Gradle client side JVM explodes with OOM due to xcodebuild logs

Tools. Gradle. Native

• KT-71419 Light bundle KGP IT run against a stable K/N version

Tools. JPS

• KT-71450 Constant build failure: com.intellij.util.io.ClosedStorageException: storage is already closed

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