chore(release): publish

- netlify-cms-app@2.11.11
 - netlify-cms-core@2.15.4
 - netlify-cms-locales@1.7.0
 - netlify-cms-proxy-server@1.0.5
 - netlify-cms-widget-code@1.1.3
 - netlify-cms@2.10.14

packages/netlify-cms-core/package.json

@@ -1,7 +1,7 @@
 {
   "name": "netlify-cms-core",
   "description": "Netlify CMS core application, see netlify-cms package for the main distribution.",
-  "version": "2.15.3",
+  "version": "2.15.4",
   "repository": "https://github.com/netlify/netlify-cms/tree/master/packages/netlify-cms-core",
   "bugs": "https://github.com/netlify/netlify-cms/issues",
   "module": "dist/esm/index.js",