python3Packages.poolsense: migrate to hash option in fetcher

pkgs/development/python-modules/poolsense/default.nix

···
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "sha256-WCyuhk77QNJAiuzccrb2u0mfc81LYrYSSq9atgO0LdE=";
+    hash = "sha256-WCyuhk77QNJAiuzccrb2u0mfc81LYrYSSq9atgO0LdE=";
   };
 
   propagatedBuildInputs = [ aiohttp ];