chore(deps-dev): bump mini-css-extract-plugin from 1.3.5 to 1.4.0

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.3.5 to 1.4.0.
- [Release notes](https://github.com/webpack-contrib/mini-css-extract-plugin/releases)
- [Changelog](https://github.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack/mini-css-extract-plugin@v1.3.5...v1.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

yarn.lock

@@ -4038,9 +4038,9 @@ mimic-fn@^2.1.0:
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
 mini-css-extract-plugin@^1.3.4:
-  version "1.3.5"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.3.5.tgz#252166e78879c106e0130f229d44e0cbdfcebed3"
-  integrity sha512-tvmzcwqJJXau4OQE5vT72pRT18o2zF+tQJp8CWchqvfQnTlflkzS+dANYcRdyPRWUWRkfmeNTKltx0NZI/b5dQ==
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.4.0.tgz#c8e571c4b6d63afa56c47260343adf623349c473"
+  integrity sha512-DyQr5DhXXARKZoc4kwvCvD95kh69dUupfuKOmBUqZ4kBTmRaRZcU32lYu3cLd6nEGXhQ1l7LzZ3F/CjItaY6VQ==
   dependencies:
     loader-utils "^2.0.0"
     schema-utils "^3.0.0"