chore: Release 6.1.6 (#177)

Co-authored-by: github-actions[bot] <noreply@onesignal.com>

Author: onesignal-deploy

OneSignalSDK.DotNet.nuspec

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <package xmlns="http://schemas.microsoft.com/packaging/2012/06/nuspec.xsd">
     <metadata>
-        <version>6.1.5</version>
+        <version>6.1.6</version>
         <id>OneSignalSDK.DotNet</id>
         <title>OneSignal SDK for .NET and MAUI</title>
         <authors>OneSignal</authors>