Bump postcss from 8.1.14 to 8.2.1

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.14 to 8.2.1.
- [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/8.1.14...8.2.1)

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

package.json

@@ -191,7 +191,7 @@
 		"parsimmon": "1.16.0",
 		"pg": "8.5.1",
 		"portscanner": "2.2.0",
-		"postcss": "8.1.14",
+		"postcss": "8.2.1",
 		"postcss-loader": "4.1.0",
 		"prismjs": "1.22.0",
 		"probe-image-size": "6.0.0",