CircleCI: avoid installing Xcodes when not needed (#3585)

Most jobs don't actually use it, so this moves the installation out of
`install-dependencies`.

.circleci/config.yml

@@ -71,6 +71,8 @@ commands:
       runtime-name:
         type: string
     steps:
+      - install-brew-dependency:
+          dependency_name: 'xcodes'
       - run:
           name: Install simulator
           command: | # Print all available simulators and install required one
@@ -114,14 +116,11 @@ commands:
       - install-brew-dependency:
           dependency_name: 'swiftlint'
       - run: brew tap robotsandpencils/made
-      - install-brew-dependency:
-          dependency_name: 'xcodes'
       - save_cache:
           key: homebrew-cache-{{ checksum "Brewfile.lock.json" }}-{{ arch }}
           paths:
             - /usr/local/Cellar/swiftlint/
             - /usr/local/Cellar/xcbeautify/
-            - /usr/local/Caskroom/xcodes/
             - /Users/$USER/Library/Caches/Homebrew/
 
   install-brew-dependency: