nodejs-11_x: 11.7.0 -> 11.11.0 (security)

https://github.com/nodejs/node/blob/master/doc/changelogs/CHANGELOG_V11.md

(see notes for all versions after 11.7.0)

(cherry picked from commit 5d527793ae87fdba17a2fecb666a98c4c2e569d4)

pkgs/development/web/nodejs/v11.nix

···
 in
   buildNodejs {
     inherit enableNpm;
-    version = "11.7.0";
-    sha256 = "18md1xz055rxds4i831rmmya0xda7cc0wdmr1jnj8vigfbcbvzh7";
+    version = "11.11.0";
+    sha256 = "1732jv95xza8813wk7qy22jxh2x9lnc9lr0rqkql7ggf03wymn56";
   }