Update dependencies and perform a little cleanup

Author: abelgardep

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        kotlinVersion = '1.3.72'
+        kotlinVersion = '1.4.10'
         moshiVersion = "1.9.2"
     }
 
@@ -9,9 +9,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
-        classpath "org.jetbrains.kotlin:kotlin-allopen:$kotlinVersion"
     }
 }
 

owncloudComLibrary/build.gradle

@@ -1,7 +1,6 @@
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
-apply plugin: 'kotlin-allopen'
 
 dependencies {
     api 'com.squareup.okhttp3:okhttp:4.6.0'
@@ -17,11 +16,6 @@ dependencies {
     kapt "com.squareup.moshi:moshi-kotlin-codegen:$moshiVersion"
 }
 
-allOpen {
-    // allows mocking for classes w/o directly opening them for release builds
-    annotation 'com.owncloud.android.lib.testing.OpenClass'
-}
-
 android {
     compileSdkVersion 29