Use gradle catalog.

build.gradle.kts

@@ -5,8 +5,8 @@ import org.jetbrains.kotlin.cli.common.toBooleanLenient
 
 buildscript {
     dependencies {
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.20")
+        classpath(libs.kotlin.gradle.plugin)
-        classpath("com.google.gms:google-services:4.4.0")
+        classpath(libs.gms.google.services)
     }
 }
 

gradle/libs.versions.toml

@@ -68,6 +68,7 @@ android_gradle_plugin = { module = "com.android.tools.build:gradle", version.ref
 # https://developer.android.com/studio/write/java8-support#library-desugaring-versions
 android_desugar = "com.android.tools:desugar_jdk_libs:2.0.4"
 kotlin_gradle_plugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
+gms_google_services = "com.google.gms:google-services:4.4.0"
 # https://firebase.google.com/docs/android/setup#available-libraries
 google_firebase_bom = "com.google.firebase:firebase-bom:32.5.0"