Merge pull request #7862 from nextcloud/dependabot/gradle/mockitoVersion-3.7.7

Bump mockitoVersion from 3.7.0 to 3.7.7

build.gradle

@@ -58,7 +58,7 @@ ext {
     prismVersion = "2.0.0"
     butterknifeVersion = "10.2.3"
     androidLibraryVersion = "master-SNAPSHOT"
-    mockitoVersion = "3.7.0"
+    mockitoVersion = "3.7.7"
     mockkVersion = "1.10.4"
     powermockVersion = "2.0.9"
     byteBuddyVersion = "1.10.19"