Bump postcss from 8.1.10 to 8.1.12

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.10 to 8.1.12.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.1.10...8.1.12)

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

package.json

@@ -50,7 +50,7 @@
     "lato-font": "^3.0.0",
     "mini-css-extract-plugin": "^1.3.0",
     "node-sass": "^5.0.0",
-    "postcss": "^8.1.6",
+    "postcss": "^8.1.12",
     "postcss-loader": "^4.0.4",
     "sass": "^1.29.0",
     "sass-loader": "^10.0.5",