chore(deps-dev): bump postcss from 8.5.5 to 8.5.6 in /themes/devops-maturity in the npm-deps group (#20)

chore(deps-dev): bump postcss

Bumps the npm-deps group in /themes/devops-maturity with 1 update: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.5 to 8.5.6
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.5...8.5.6)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm-deps
...

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Author: dependabot[bot]

themes/devops-maturity/package-lock.json

@@ -26,7 +26,7 @@
     "autoprefixer": "10.4.21",
     "cssnano": "7.0.7",
     "sass": "1.89.2",
-    "postcss": "8.5.5",
+    "postcss": "8.5.6",
     "postcss-cli": "11.0.1",
     "webpack": "5.99.9",
     "webpack-cli": "6.0.1"