chore(release): publish

- netlify-cms-app@2.12.4
 - netlify-cms-backend-proxy@1.0.6
 - netlify-cms-core@2.23.4
 - netlify-cms-locales@1.10.3
 - netlify-cms-widget-file@2.6.4
 - netlify-cms@2.10.40

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": "2.23.3",
+  "version": "2.23.4",
   "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",