Bump postcss from 8.5.3 to 8.5.4

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.3 to 8.5.4.
- [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/8.5.3...8.5.4)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -7,7 +7,7 @@
 		"autoprefixer": "^10.4.21",
 		"cjs-loader": "^0.1.0",
 		"lunr": "^2.3.9",
-		"postcss": "^8.5.1",
+		"postcss": "^8.5.4",
 		"postcss-cli": "^11.0.1"
 	},
 	"description": "The source code for fundor333.com",