pantheon.gala: 8.1.0 -> 8.2.2

https://github.com/elementary/gala/compare/8.1.0...8.2.2

pkgs/desktops/pantheon/desktop/gala/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "gala";
-  version = "8.1.0";
+  version = "8.2.2";
 
   src = fetchFromGitHub {
     owner = "elementary";
     repo = pname;
     rev = version;
-    hash = "sha256-C0Vct2xuGHd/G5x0Faif0DfpyNyCLJDxki+O9697c2s=";
+    hash = "sha256-S71NryqJjWXZgyBj6q088bdjt/NnAEJ6oeUO2OMJ3Z4=";
   };
 
   patches = [