Bump mini-css-extract-plugin from 0.7.0 to 0.8.0 (#11927)

Bumps [mini-css-extract-plugin](https://github.com/webpack-contrib/mini-css-extract-plugin) from 0.7.0 to 0.8.0.
- [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](https://github.com/webpack-contrib/mini-css-extract-plugin/compare/v0.7.0...v0.8.0)

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

package.json

@@ -111,7 +111,7 @@
     "lodash": "^4.17.14",
     "mark-loader": "^0.1.6",
     "marky": "^1.2.1",
-    "mini-css-extract-plugin": "^0.7.0",
+    "mini-css-extract-plugin": "^0.8.0",
     "mkdirp": "^0.5.1",
     "npmlog": "^4.1.2",
     "object-assign": "^4.1.1",

yarn.lock

@@ -6686,10 +6686,10 @@ mimic-fn@^1.0.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-1.2.0.tgz#820c86a39334640e99516928bd03fca88057d022"
   integrity sha512-jf84uxzwiuiIVKiOLpfYk7N46TSy8ubTonmneY9vrpHNAnp0QBt2BxWV9dO3/j+BoVAb+a5G6YDPW3M5HOdMWQ==
 
-mini-css-extract-plugin@^0.7.0:
-  version "0.7.0"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.7.0.tgz#5ba8290fbb4179a43dd27cca444ba150bee743a0"
-  integrity sha512-RQIw6+7utTYn8DBGsf/LpRgZCJMpZt+kuawJ/fju0KiOL6nAaTBNmCJwS7HtwSCXfS47gCkmtBFS7HdsquhdxQ==
+mini-css-extract-plugin@^0.8.0:
+  version "0.8.0"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-0.8.0.tgz#81d41ec4fe58c713a96ad7c723cdb2d0bd4d70e1"
+  integrity sha512-MNpRGbNA52q6U92i0qbVpQNsgk7LExy41MdAlG84FeytfDOtRIf/mCHdEgG8rpTKOaNKiqUnZdlptF469hxqOw==
   dependencies:
     loader-utils "^1.1.0"
     normalize-url "1.9.1"