chore: upgrade Kotlin to 1.8.0 (#780)

Author: lauzadis

.changes/98d6e111-a6a4-4de3-896d-214e466b4026.json

@@ -0,0 +1,5 @@
+{
+    "id": "98d6e111-a6a4-4de3-896d-214e466b4026",
+    "type": "misc",
+    "description": "Upgrade Kotlin version to 1.8.0"
+}

gradle.properties

@@ -9,7 +9,7 @@ kotlin.mpp.enableCompatibilityMetadataVariant=true
 sdkVersion=0.15.0-SNAPSHOT
 
 # kotlin
-kotlinVersion=1.7.10
+kotlinVersion=1.8.0
 dokkaVersion=1.7.10
 
 # kotlin libraries
@@ -31,7 +31,7 @@ ktlintVersion=0.48.1
 kotestVersion=5.5.4
 kotlinCompileTestingVersion=1.4.9
 jacocoVersion=0.8.8
-kotlinxBenchmarkVersion=0.4.6
+kotlinxBenchmarkVersion=0.4.7
 testContainersVersion=1.17.6
 
 # serialization

runtime/runtime-core/build.gradle.kts

@@ -4,7 +4,7 @@
  */
 
 plugins {
-    kotlin("plugin.serialization") version "1.7.10"
+    kotlin("plugin.serialization") version "1.8.0"
 }
 
 description = "Client runtime for Smithy services generated by smithy-kotlin"

smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/core/KotlinDependency.kt

@@ -34,7 +34,7 @@ private fun getDefaultRuntimeVersion(): String {
 // publishing info
 const val RUNTIME_GROUP: String = "aws.smithy.kotlin"
 val RUNTIME_VERSION: String = System.getProperty("smithy.kotlin.codegen.clientRuntimeVersion", getDefaultRuntimeVersion())
-val KOTLIN_COMPILER_VERSION: String = System.getProperty("smithy.kotlin.codegen.kotlinCompilerVersion", "1.7.10")
+val KOTLIN_COMPILER_VERSION: String = System.getProperty("smithy.kotlin.codegen.kotlinCompilerVersion", "1.8.0")
 
 enum class SourceSet {
     CommonMain,