Upgrade kotlinx.serialization to v1.6.3

This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update external/kotlinx.serialization
For more info, check https://cs.android.com/android/platform/superproject/+/main:tools/external_updater/README.md

Test: TreeHugger
Change-Id: I0a33712c9ac0a953307b3e8c3470f29cdd6dcaec
diff --git a/gradle.properties b/gradle.properties
index 0c58f54..099a38f 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,34 +1,29 @@
 #
-# Copyright 2017-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
+# Copyright 2017-2022 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
 #
 
 group=org.jetbrains.kotlinx
-version=1.3.4-SNAPSHOT
+version=1.6.4-SNAPSHOT
 
-kotlin.version=1.6.21
+kotlin.version=1.9.22
 
-# This version take precedence if 'bootstrap' property passed to project
-kotlin.version.snapshot=1.6.255-SNAPSHOT
+# This version takes precedence if 'bootstrap' property passed to project
+kotlin.version.snapshot=2.0.255-SNAPSHOT
 # Also set KONAN_LOCAL_DIST environment variable in bootstrap mode to auto-assign konan.home
 
 junit_version=4.12
 jackson_version=2.10.0.pr1
-dokka_version=1.6.0
+dokka_version=1.9.10
 native.deploy=
-validator_version=0.7.1
-knit_version=0.3.0
-coroutines_version=1.3.9
+validator_version=0.13.2
+knit_version=0.5.0
+# Only for tests
+coroutines_version=1.6.4
 kover_version=0.4.2
+okio_version=3.6.0
 
 kover.enabled=true
 
-kotlin.mpp.enableGranularSourceSetsMetadata=true
-kotlin.mpp.enableCompatibilityMetadataVariant=true
-kotlin.mpp.stability.nowarn=true
-
-kotlin.js.compiler=both
-kotlin.incremental.multiplatform=true
-
 org.gradle.parallel=true
 org.gradle.caching=true