Bump material to alpha-08

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

build.gradle

@@ -266,7 +266,7 @@ dependencies {
     qaImplementation "com.github.nextcloud:android-library:$androidLibraryVersion"
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'com.google.android.material:material:1.1.0-alpha07'
+    implementation 'com.google.android.material:material:1.1.0-alpha08'
     implementation 'com.jakewharton:disklrucache:2.0.2'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'androidx.cardview:cardview:1.0.0'