chore(deps): bump kotlin.version from 2.1.20 to 2.1.21

[dependabot]

Bumps kotlin.version from 2.1.20 to 2.1.21.
Updates org.jetbrains.kotlin:kotlin-bom from 2.1.20 to 2.1.21

Release notes

Sourced from org.jetbrains.kotlin:kotlin-bom's releases.

Kotlin 2.1.21

Changelog

Backend. Native. Debug

• KT-75991 Xcode 16.3: Fix lldb stepping test over an inline function

Compiler

• KT-75992 Xcode 16.3: stacktraces on simulators are not symbolicated
• KT-76663 KJS: KotlinNothingValueException caused by expression return since 2.1.20
• KT-75756 Backend Internal error: Exception during IR lowering when trying to access variable from providedProperties in class within kotlin custom script
• KT-76209 CONFLICTING_UPPER_BOUNDS on Nothing bound
• KT-70352 K2: False-negative CONFLICTING_UPPER_BOUNDS on Nothing bound
• KT-74739 Native: "IllegalArgumentException: All constructors should've been lowered: FUNCTION_REFERENCE"
• KT-75483 Native: redundant unboxing generated with smart cast
• KT-71425 IR Inliner: investigate return type of an inlined block

Native

• KT-76252 Native: executable crash with generic value classes with 2.1.20

Native. C and ObjC Import

• KT-75781 Xcode 16.3: Fix cinterop tests failing with fatal error: could not build module '_stdint'

Native. Runtime. Memory

• KT-74280 Native: GC.collect crashes with -Xallocator=std

Tools. CLI

• KT-75588 [2.1.20-RC] "was compiled by a pre-release version of Kotlin and cannot be loaded by this version of the compiler" warnings despite using the same compiler version
• KT-74663 kotlinc-js CLI: not providing -ir-output-dir results in NullPointerException

Tools. Compiler Plugins

• KT-76162 "IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER" after updating to 2.1.20

Tools. Gradle

• KT-73682 Compatibility with Gradle 8.12 release
• KT-73142 Kotlin Gradle plugin: Remove usage of Gradle's internal ExecHandleBuilder
• KT-36004 Update 'org.gradle.usage' attribute rules to support the 'JAVA_API' and 'JAVA_RUNTIME' value
• KT-73968 KotlinDependencyManagement tries to mutate configuration after it was resolved
• KT-73684 Run integration tests against Gradle 8.12
• KT-72694 Accessing Task.project during execution is being deprecated in Gradle 8.12
• KT-73683 Compile against Gradle API 8.12

Tools. Gradle. JS

... (truncated)

Changelog

Sourced from org.jetbrains.kotlin:kotlin-bom's changelog.

2.1.21-RC2

Tools. Gradle. JS

• KT-77119 KJS: Gradle: Setting custom environment variables in KotlinJsTest tasks no longer works

2.1.21-RC

Backend. Native. Debug

• KT-75991 Xcode 16.3: Fix lldb stepping test over an inline function

Compiler

• KT-75992 Xcode 16.3: stacktraces on simulators are not symbolicated
• KT-76663 KJS: KotlinNothingValueException caused by expression return since 2.1.20
• KT-75756 Backend Internal error: Exception during IR lowering when trying to access variable from providedProperties in class within kotlin custom script
• KT-76209 CONFLICTING_UPPER_BOUNDS on Nothing bound
• KT-70352 K2: False-negative CONFLICTING_UPPER_BOUNDS on Nothing bound
• KT-74739 Native: "IllegalArgumentException: All constructors should've been lowered: FUNCTION_REFERENCE"
• KT-75483 Native: redundant unboxing generated with smart cast
• KT-71425 IR Inliner: investigate return type of an inlined block

Compose compiler

• b/408013789 Add missing return for the default function wrappers
• b/405541364 Realize coalescable children in the body of key call
• b/401484249 Generate a group around Array constructor call
• b/400380396 Fix missing endMovableGroup call with early return in key function

Native

• KT-76252 Native: executable crash with generic value classes with 2.1.20

Native. C and ObjC Import

• KT-75781 Xcode 16.3: Fix cinterop tests failing with fatal error: could not build module '_stdint'

Native. Runtime. Memory

• KT-74280 Native: GC.collect crashes with -Xallocator=std

Tools. CLI

• KT-74663 kotlinc-js CLI: not providing -ir-output-dir results in NullPointerException

Tools. Compiler Plugins

• KT-76162 "IllegalStateException: No mapping for symbol: VALUE_PARAMETER INSTANCE_RECEIVER" after updating to 2.1.20

... (truncated)

Commits

• f59375a Add ChangeLog for 2.1.21-RC2
• 301186f [Gradle] Fix passing process environment when launching KotlinKarma tests
• 12b4021 Add changelog for 2.1.21-RC
• e16f5a8 [IC] Update inline function snapshotting
• 5f12d8b [Cherry-picks] Update BTA specific parts for the release branch
• f025799 [IC] Additional test cases for inline function snapshotting
• 58df05e [Tests] More tests for inline fun abi snapshotting
• 9512893 [KGP] Experimental: support incremental changes in inlined local classes
• 950cee5 [IC] Additional test cases for inlined lambda snapshotting
• a0a8ca0 [BTA Tests] Fix changedSources tracking when compilation fail is expected
• Additional commits viewable in compare view

Updates org.jetbrains.kotlin:kotlin-maven-plugin from 2.1.20 to 2.1.21

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