Update fastlane to support signing and TestFlight

ios/JellyfinAudioPlayer/Info.plist

@@ -21,7 +21,7 @@
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>3</string>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>NSAppTransportSecurity</key>
@@ -42,7 +42,7 @@
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>audio</string>
-		<string>processing</string>
+		<string>fetch</string>
 	</array>
 	<key>UILaunchStoryboardName</key>
 	<string>LaunchScreen</string>