Fix 'yarn build'

Pin mini-css-extract-plugin version. See
webpack-contrib/mini-css-extract-plugin#896.

Author: srittau

package.json

@@ -47,5 +47,8 @@
     "@types/uuid": "^8.3.0",
     "prettier": "^2.2.1"
   },
+  "resolutions": {
+    "mini-css-extract-plugin": "~2.4.5"
+  },
   "proxy": "http://localhost:8000"
 }

yarn.lock

@@ -5801,10 +5801,10 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
-mini-css-extract-plugin@^2.4.5:
-  version "2.5.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.5.0.tgz#4cc8300165fd408e8d2bf7381e6728fcda6fd1ae"
-  integrity sha512-hWAswjzsausaaIjk4GiUtoiNnsMc8tLAA2TZ0vbMDZcxKYS/b3UBGNElBjgQ4QYztYR+nsKp5h2Lo1NL3zz2bg==
+mini-css-extract-plugin@^2.4.5, mini-css-extract-plugin@~2.4.5:
+  version "2.4.7"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-2.4.7.tgz#b9f4c4f4d727c7a3cd52a11773bb739f00177fac"
+  integrity sha512-euWmddf0sk9Nv1O0gfeeUAvAkoSlWncNLF77C0TP2+WoPvy8mAHKOzMajcCz2dzvyt3CNgxb1obIEVFIRxaipg==
   dependencies:
     schema-utils "^4.0.0"