feat: re-update to Kotlin 2.3.20 after resolving daemon issue.

Author: autonomousapps

build-logic/build.gradle.kts

@@ -1,7 +1,7 @@
 // Copyright (c) 2026. Tony Robalik.
 // SPDX-License-Identifier: Apache-2.0
 plugins {
-  id("org.jetbrains.kotlin.jvm") version "2.2.21" apply false
+  id("org.jetbrains.kotlin.jvm") version "2.3.20" apply false
   alias(libs.plugins.dependencyAnalysis)
 }
 

build-logic/convention/build.gradle.kts

@@ -67,8 +67,7 @@ dependencies {
     because("For extending Gradle Plugin-Publish Plugin functionality")
   }
 
-  // Need to use embedded version for Gradle 9 compatibility.
-  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:${embeddedKotlinVersion}") {
+  implementation(libs.kotlin.gradle) {
     because("For applying the kotlin-jvm plugin")
   }
   implementation(libs.kotlinDokkaGradlePlugin)

gradle/libs.versions.toml

@@ -22,15 +22,10 @@ javaTarget = "11"
 jdkVersion = "17"
 jspecify = "1.0.0"
 junit = "5.14.1"
-# TODO(tsr): downgraded to 2.2.21 due to issues with the kotlin-daemon-client.
-#  See https://kotlinlang.slack.com/archives/C19FD9681/p1775698198510429.
 # IMPORTANT: keep this version in sync with build-logic/build.gradle.kts
-#kotlin = "2.3.20"
-#kotlinForAndroidtests = "2.3.20"
-#kotlinMetadata = "2.3.20"
-kotlin = "2.2.21"
-kotlinForAndroidtests = "2.2.21"
-kotlinMetadata = "2.2.21"
+kotlin = "2.3.20"
+kotlinForAndroidtests = "2.3.20"
+kotlinMetadata = "2.3.20"
 # TODO(tsr): update Dokka
 kotlinDokka = "2.0.0"
 # Cannot be called kotlin-editor as it causes `libs.versions.kotlin.get()` to fail