Coil 2.x upgrade (#6725)

* Migrate to Coil 2

* Adapt to use coil disk cache

* Update to alpha 7

* Update to alpha 8

* Update to rc01

app/src/main/java/eu/kanade/tachiyomi/network/NetworkHelper.kt

@@ -1,7 +1,6 @@
 package eu.kanade.tachiyomi.network
 
 import android.content.Context
-import coil.util.CoilUtils
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.network.interceptor.CloudflareInterceptor
 import eu.kanade.tachiyomi.network.interceptor.UserAgentInterceptor
@@ -49,8 +48,6 @@ class NetworkHelper(context: Context) {
 
     val client by lazy { baseClientBuilder.cache(Cache(cacheDir, cacheSize)).build() }
 
-    val coilClient by lazy { baseClientBuilder.cache(CoilUtils.createDefaultCache(context)).build() }
-
     val cloudflareClient by lazy {
         client.newBuilder()
             .addInterceptor(CloudflareInterceptor(context))