Bump mini-css-extract-plugin from 1.2.0 to 1.2.1 (#15077)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 1.2.0 to 1.2.1.
- [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](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v1.2.0...v1.2.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -110,7 +110,7 @@
     "lodash": "^4.17.19",
     "mark-loader": "^0.1.6",
     "marky": "^1.2.1",
-    "mini-css-extract-plugin": "^1.2.0",
+    "mini-css-extract-plugin": "^1.2.1",
     "mkdirp": "^1.0.4",
     "npmlog": "^4.1.2",
     "object-assign": "^4.1.1",

yarn.lock

@@ -6988,10 +6988,10 @@ 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@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.2.0.tgz#f1bdfa7bb6f6a238bc327f813f204283ea33ee36"
-  integrity sha512-iBZokjaIjHvI4N0AURx5aPBawcmxB/d2NYikxZ4J57Lg5sDShUPyWvuSWl1dueI5oCs7nz8V7qtOCaLjB7AYPw==
+mini-css-extract-plugin@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.2.1.tgz#30ea7dee632b3002b0c77aeed447790408cb247e"
+  integrity sha512-G3yw7/TQaPfkuiR73MDcyiqhyP8SnbmLhUbpC76H+wtQxA6wfKhMCQOCb6wnPK0dQbjORAeOILQqEesg4/wF7A==
   dependencies:
     loader-utils "^2.0.0"
     schema-utils "^3.0.0"