fedora-backgrounds.f37: init at 37.0.5

pkgs/data/misc/fedora-backgrounds/default.nix

···
       hash = "sha256-DZr1YHltojl02X/3sErqB/29JBDy/7lDZKnHD+KouHc=";
     };
   };
+
+  f37 = fedoraBackground rec {
+    version = "37.0.5";
+    src = fetchurl {
+      url = "https://github.com/fedoradesign/backgrounds/releases/download/v${version}/f${lib.versions.major version}-backgrounds-${version}.tar.xz";
+      hash = "sha256-bkjxJDDU0dZURKIK1sd+EOnPt9vvJ5HqHkc6OhPBBn0=";
+    };
+  };
 }