Update year to 2023 in COPYRIGHT_HEADER.txt

This commit is the result of changing the year to 2023 in
COPYRIGHT_HEADER.txt and running all `generate*` tasks in
`generators/build.gradle.kts`.

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinCommonOptions.kt

@@ -41,4 +41,4 @@ interface KotlinCommonOptions : org.jetbrains.kotlin.gradle.dsl.KotlinCommonTool
     var useK2: kotlin.Boolean
         get() = options.useK2.get()
         set(value) = options.useK2.set(value)
-}
+}

libraries/tools/kotlin-gradle-plugin-api/src/common/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinJsCompilerOptions.kt

@@ -107,4 +107,4 @@ interface KotlinJsCompilerOptions : org.jetbrains.kotlin.gradle.dsl.KotlinCommon
      */
     @get:org.gradle.api.tasks.Input
     val typedArrays: org.gradle.api.provider.Property<kotlin.Boolean>
-}
+}