nix: allow XCode versions 11.5 and higher

This is kinda hacky, but is simple enough since the version check uses grep.

For details see:
https://github.com/status-im/nixpkgs/blob/status-mods/pkgs/development/mobile/xcodeenv/compose-xcodewrapper.nix

Signed-off-by: Jakub Sokołowski <jakub@status.im>

nix/overlay.nix

@@ -32,9 +32,11 @@ in {
   gradlePropParser = callPackage ./tools/gradlePropParser.nix { };
 
   # Package version adjustments
-  xcodeWrapper = super.xcodeenv.composeXcodeWrapper { version = "11.5"; };
-  openjdk = super.pkgs.openjdk8_headless;
   nodejs = super.pkgs.nodejs-12_x;
+  openjdk = super.pkgs.openjdk8_headless;
+  xcodeWrapper = super.xcodeenv.composeXcodeWrapper {
+    version = "11\.[5-9]\+\.\?[0-9]\?\+"; # uses grep
+  };
 
   # Android environement
   androidEnvCustom = callPackage ./pkgs/android-sdk { };