Merge pull request #3581 from nextcloud/dependabot/gradle/com.android.tools.build-gradle-3.3.1

Bump gradle from 3.3.0 to 3.3.1

build.gradle

@@ -15,7 +15,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:3.3.1'
         classpath('com.dicedmelon.gradle:jacoco-android:0.1.3') {
             exclude group: 'org.codehaus.groovy', module: 'groovy-all'
         }