Merge pull request #1664 from nextcloud/dependabot/gradle/com.google.code.gson-gson-2.8.9

Bump gson from 2.8.8 to 2.8.9

app/build.gradle

@@ -264,7 +264,7 @@ dependencies {
     implementation "com.afollestad.material-dialogs:bottomsheets:${materialDialogsVersion}"
     implementation "com.afollestad.material-dialogs:lifecycle:${materialDialogsVersion}"
 
-    implementation 'com.google.code.gson:gson:2.8.8'
+    implementation 'com.google.code.gson:gson:2.8.9'
     implementation 'com.google.android.exoplayer:exoplayer:2.15.1'
 
     implementation 'com.github.chrisbanes:PhotoView:2.3.0'