rubocops/cask: on_#{os_version} is after [version & sha256] group

- This still doesn't pass `brew readall` for Casks, but it gets us a
  little closer since if `url` has a `version` interpolated in it, the
  `version` stanza has to come first.
- See https://github.com/Homebrew/homebrew-cask/pull/143201 for the
  current failures.

Library/Homebrew/rubocops/cask/constants/stanza.rb

@@ -14,8 +14,8 @@ module RuboCop
 
       STANZA_GROUPS = [
         [:arch, :on_arch_conditional],
-        ON_SYSTEM_METHODS_STANZA_ORDER,
         [:version, :sha256],
+        ON_SYSTEM_METHODS_STANZA_ORDER,
         [:language],
         [:url, :appcast, :name, :desc, :homepage],
         [:livecheck],

Library/Homebrew/test/support/fixtures/cask/Casks/with-depends-on-macos-failure.rb

@@ -2,9 +2,6 @@ cask "with-depends-on-macos-failure" do
   version "1.2.3"
   sha256 "67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94"
 
-  url "file://#{TEST_FIXTURE_DIR}/cask/caffeine.zip"
-  homepage "https://brew.sh/with-depends-on-macos-failure"
-
   # guarantee a mismatched release
   on_mojave :or_older do
     depends_on macos: :catalina
@@ -16,5 +13,8 @@ cask "with-depends-on-macos-failure" do
     depends_on macos: :catalina
   end
 
+  url "file://#{TEST_FIXTURE_DIR}/cask/caffeine.zip"
+  homepage "https://brew.sh/with-depends-on-macos-failure"
+
   app "Caffeine.app"
 end