Update kotlin monorepo (#1614)

* Update kotlin monorepo

* Update ksp to v1.8.0-1.0.9

* Lower metadata to 0.5.0

* Update KCT

* Update to compilerOptions

* Suppress deprecation

* Add missing java target too

* Raise it again because it's broken on all

* Kotlin 1.8.20 + updated kotlinpoet

* Update kotlinpoet

* Update kotlin

* Fix KSP equality check for KotlinPoet 1.13.x

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Jake Wharton <github@jakewharton.com>
Co-authored-by: Zac Sweers <pandanomic@gmail.com>

moshi-kotlin-codegen/build.gradle.kts

@@ -13,15 +13,20 @@ plugins {
 }
 
 tasks.withType<KotlinCompile>().configureEach {
-  kotlinOptions {
-    @Suppress("SuspiciousCollectionReassignment")
-    freeCompilerArgs += listOf(
+  compilerOptions {
+    freeCompilerArgs.addAll(
       "-opt-in=com.squareup.kotlinpoet.metadata.KotlinPoetMetadataPreview",
       "-opt-in=com.squareup.moshi.kotlin.codegen.api.InternalMoshiCodegenApi",
     )
   }
 }
 
+tasks.compileTestKotlin {
+  compilerOptions {
+    freeCompilerArgs.add("-opt-in=org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi")
+  }
+}
+
 // --add-opens for kapt to work. KGP covers this for us but local JVMs in tests do not
 tasks.withType<Test>().configureEach {
   jvmArgs(