Update Kotlin and Coroutine version

app/build.gradle

@@ -135,7 +135,10 @@ android {
 }
 
 tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
-        kotlinOptions.allWarningsAsErrors = true
+        kotlinOptions {
+            allWarningsAsErrors = true
+            freeCompilerArgs += "-Xuse-experimental=kotlinx.coroutines.ExperimentalCoroutinesApi"
+        }
 }
 
 dependencies {

app/src/main/java/org/mozilla/focus/utils/Debounce.kt

@@ -5,9 +5,7 @@
 package org.mozilla.focus.utils
 
 import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.Job
-import kotlinx.coroutines.ObsoleteCoroutinesApi
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.channels.ReceiveChannel
 import kotlinx.coroutines.channels.consumeEach
@@ -22,8 +20,6 @@ import kotlinx.coroutines.launch
  * @param channel the channel to debounce
  * @return a throttled channel
  */
-@ObsoleteCoroutinesApi
-@ExperimentalCoroutinesApi
 fun <T> CoroutineScope.debounce(time: Long, channel: ReceiveChannel<T>): ReceiveChannel<T> =
     produce(coroutineContext, Channel.CONFLATED) {
         var job: Job? = null

build.gradle

@@ -4,8 +4,8 @@ buildscript {
     ext.architecture_components_version = '2.1.0'
     ext.support_libraries_version = '1.0.0'
     ext.espresso_version = '3.1.0-alpha4'
-    ext.kotlin_version = '1.3.61'
-    ext.coroutines_version = '1.3.0'
+    ext.kotlin_version = '1.4.30'
+    ext.coroutines_version = '1.4.2'
     ext.mozilla_components_version = '73.0.8'
     // Pinning the last working version of the service-telemetry component until we decide
     // what we want to do with telemetry in the app.
@@ -33,7 +33,6 @@ plugins {
     // other methods involve using undocumented APIs
     // https://docs.gradle.org/current/userguide/plugins.html#plugins_dsl_limitations
     id "io.gitlab.arturbosch.detekt" version "1.0.0.RC6-3"
-    id "org.jetbrains.kotlin.kapt" version "1.2.50"
 }
 
 detekt {