Merge pull request #1524 from nextcloud/dependabot/gradle/com.google.android.exoplayer-exoplayer-2.15.0

Bump exoplayer from 2.14.2 to 2.15.0

app/build.gradle

@@ -275,7 +275,7 @@ dependencies {
     implementation "com.afollestad.material-dialogs:lifecycle:${materialDialogsVersion}"
 
     implementation 'com.google.code.gson:gson:2.8.7'
-    implementation 'com.google.android.exoplayer:exoplayer:2.14.2'
+    implementation 'com.google.android.exoplayer:exoplayer:2.15.0'
 
     implementation 'com.github.chrisbanes:PhotoView:2.3.0'
     implementation 'pl.droidsonroids.gif:android-gif-drawable:1.2.23'