Bump postcss from 8.2.7 to 8.2.8

Bumps [postcss](https://github.com/postcss/postcss) from 8.2.7 to 8.2.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.2.7...8.2.8)

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

package.json

@@ -19,7 +19,7 @@
   "devDependencies": {
     "autoprefixer": "^10.2.5",
     "cssnano": "^4.1.10",
-    "postcss": "^8.2.7",
+    "postcss": "^8.2.8",
     "postcss-cli": "^8.3.1",
     "postcss-nested": "^5.0.5",
     "sass": "^1.32.8",