fix(version): fix the file version of the app

Author: Belphemur

SoundSwitch/Properties/AssemblyInfo.cs

@@ -38,5 +38,5 @@
 //
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
-[assembly: AssemblyFileVersion("6.9.0-beta.1")]
+[assembly: AssemblyFileVersion("6.9.0")]
 [assembly: AssemblyInformationalVersion("6.9.0-beta.1")]