ci: update macos job to start build earlier

.gitlab-ci.yml

@@ -227,6 +227,9 @@ flatpak:
 
 macos installer stable:
   stage: test
+  needs:
+    - job: "windows rust docker stable"
+      artifacts: false
   tags:
     - gst-macos-11.1
   before_script:
@@ -282,4 +285,3 @@ pages:
     # This ensures that only pushes to the default branch will trigger
     # a pages deploy
     - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
-