nodejs-8_x: 8.9.3 -> 8.9.4

pkgs/development/web/nodejs/v8.nix

···
 in
   buildNodejs {
     inherit enableNpm;
-    version = "8.9.3";
-    sha256 = "1nmjwsdql92jh6y94jpqa8cmirw6cl3cvaiqdsjyd1bbm8xxp3bl";
+    version = "8.9.4";
+    sha256 = "0vy8rlg58kg75j4sw3xadmbrwxfa56iaykmjl18g9a8wkjfdxp3c";
     patches = lib.optionals stdenv.isDarwin [ ./no-xcode-v7.patch ];
   }