Update Kotlin dependencies

Author: renovate[bot]

gradle.properties

@@ -5,7 +5,7 @@
 # Kotlin
 version=1.8.0-RC2-SNAPSHOT
 group=org.jetbrains.kotlinx
-kotlin_version=1.9.21
+kotlin_version=2.1.0
 # DO NOT rename this property without adapting kotlinx.train build chain:
 atomicfu_version=0.23.1
 
@@ -15,7 +15,7 @@ junit5_version=5.7.0
 knit_version=0.5.0
 html_version=0.7.2
 lincheck_version=2.18.1
-dokka_version=1.9.10
+dokka_version=2.0.0
 byte_buddy_version=1.10.9
 reactor_version=3.4.1
 reactive_streams_version=1.0.3
@@ -31,7 +31,7 @@ jna_version=5.9.0
 # Gradle
 jdk_toolchain_version=11
 animalsniffer_version=1.7.1
-shadow_version=7.1.2
+shadow_version=8.0.0
 #shadow_version=8.1.1 For Gradle 8, not compatible with Gradle 7
 
 # Android versions