Revert "Migrate to KSP for billing library."

This reverts commit 95d77ce.

billing/build.gradle.kts

@@ -1,7 +1,7 @@
 plugins {
     id("com.android.library")
     kotlin("android")
-    id("com.google.devtools.ksp")
+    kotlin("kapt")
 }
 
 val sgCompileSdk: Int by rootProject.extra
@@ -54,7 +54,7 @@ dependencies {
     implementation(libs.androidx.lifecycle.viewmodel)
     // Room
     implementation(libs.androidx.room.runtime)
-    ksp(libs.androidx.room.compiler)
+    kapt(libs.androidx.room.compiler)
 
     implementation(libs.timber)
 }

build.gradle.kts

@@ -4,8 +4,6 @@ plugins {
     // app, libraries
     alias(libs.plugins.android) apply false
     alias(libs.plugins.kotlin) apply false
-    // billing
-    alias(libs.plugins.ksp) apply false
     // Firebase Crashlytics
     alias(libs.plugins.google.services) apply false
     alias(libs.plugins.firebase.crashlytics) apply false

gradle/libs.versions.toml

@@ -98,8 +98,6 @@ truth = "com.google.truth:truth:1.1.3" # https://github.com/google/truth/release
 android = { id = "com.android.application", version = "8.1.0" }
 # https://kotlinlang.org/docs/releases.html#release-details
 kotlin = { id = "org.jetbrains.kotlin.android", version = "1.8.10" }
-# https://github.com/google/ksp/releases Must match Kotlin version!
-ksp = { id = "com.google.devtools.ksp", version = "1.8.10-1.0.9" }
 # https://github.com/ben-manes/gradle-versions-plugin/releases
 versions = { id = "com.github.ben-manes.versions", version = "0.47.0" }
 # https://github.com/gradle-nexus/publish-plugin/releases