Bump postcss from 7.0.14 to 8.2.13 in /css

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.14 to 8.2.13.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@7.0.14...8.2.13)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

css/package.json

@@ -22,7 +22,7 @@
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "glob-all": "^3.1.0",
     "optimize-css-assets-webpack-plugin": "^5.0.0",
-    "postcss": "^7.0.0",
+    "postcss": "^7.0.36",
     "postcss-loader": "^2.1.6",
     "postcss-prefix-selector": "^1.6.0",
     "purgecss-webpack-plugin": "^1.2.0",

css/yarn.lock

@@ -3165,19 +3165,10 @@ postcss@^6.0.0, postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14, postcss@^6.0.2
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
-postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14:
-  version "7.0.14"
-  resolved "https://registry.npmjs.org/postcss/-/postcss-7.0.14.tgz"
-  integrity sha512-NsbD6XUUMZvBxtQAJuWDJeeC4QFsmWsfozWxCJPWf3M55K9iu2iMDaKqyoOdTJ1R4usBXuxlVFAIo8rZPQD4Bg==
-  dependencies:
-    chalk "^2.4.2"
-    source-map "^0.6.1"
-    supports-color "^6.1.0"
-
-postcss@^7.0.27:
-  version "7.0.31"
-  resolved "https://registry.npmjs.org/postcss/-/postcss-7.0.31.tgz"
-  integrity sha512-a937VDHE1ftkjk+8/7nj/mrjtmkn69xxzJgRETXdAUU+IgOYPQNJF17haGWbeDxSyk++HA14UA98FurvPyBJOA==
+postcss@^7.0.0, postcss@^7.0.1, postcss@^7.0.14, postcss@^7.0.27, postcss@^7.0.36:
+  version "7.0.36"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.36.tgz#056f8cffa939662a8f5905950c07d5285644dfcb"
+  integrity sha512-BebJSIUMwJHRH0HAQoxN4u1CN86glsrwsW0q7T+/m44eXOUAxSNdHRkNZPYz5vVUbg17hFgOQDE7fZk7li3pZw==
   dependencies:
     chalk "^2.4.2"
     source-map "^0.6.1"