Version 0.13.6 (#2389)

## Summary

1. Bump flake version to 0.13.6
2. Update nixpkgs

## How was it tested?

`nix build .`

Author: Lagoja

flake.lock

@@ -11,7 +11,7 @@
       let
         pkgs = nixpkgs.legacyPackages.${system};
 
-        lastTag = "0.13.5";
+        lastTag = "0.13.6";
 
         revision = if (self ? shortRev)
                    then "${self.shortRev}"