Bump postcss from 7.0.27 to 8.2.10 (#203)

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.27 to 8.2.10.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@7.0.27...8.2.10)

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Author: dependabot[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "gzip-size": "^5.1.1",
     "is-vendor-prefixed": "^3.3.1",
     "path": "^0.12.7",
-    "postcss": "^7.0.27",
+    "postcss": "^8.2.10",
     "postcss-values-parser": "^3.1.1",
     "specificity": "^0.4.1",
     "split-css-value": "^0.1.1",