Bump postcss from 8.5.4 to 8.5.5 in the production-dependencies group

Bumps the production-dependencies group with 1 update: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.4 to 8.5.5
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.4...8.5.5)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.5
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

cli/csstools-cli/package.json

@@ -66,7 +66,7 @@
 		"css-blank-pseudo": "^7.0.1",
 		"css-has-pseudo": "^7.0.2",
 		"css-prefers-color-scheme": "^10.0.0",
-		"postcss": "^8.5.4",
+		"postcss": "^8.5.5",
 		"postcss-attribute-case-insensitive": "^7.0.1",
 		"postcss-color-functional-notation": "^7.0.10",
 		"postcss-color-hex-alpha": "^10.0.0",

package-lock.json

@@ -49,7 +49,7 @@
 	],
 	"devDependencies": {
 		"@rmenke/css-tokenizer-tests": "^1.2.0",
-		"postcss": "^8.5.4",
+		"postcss": "^8.5.5",
 		"postcss-parser-tests": "^8.8.0"
 	},
 	"scripts": {

packages/css-tokenizer/package.json

@@ -51,7 +51,7 @@
 		"postcss": "^8.4"
 	},
 	"devDependencies": {
-		"postcss": "^8.5.4"
+		"postcss": "^8.5.5"
 	},
 	"scripts": {
 		"build": "rollup -c ../../rollup/default.mjs",