build(deps-dev): bump postcss from 8.5.4 to 8.5.6 (#1073)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -67,7 +67,7 @@
         "lodash": "^4.17.21",
         "luminous-lightbox": "^2.4.0",
         "mitt": "^3.0.1",
-        "postcss": "^8.5.4",
+        "postcss": "^8.5.6",
         "postcss-100vh-fix": "^2.0.0",
         "prettier": "^3.0.0",
         "prettier-plugin-tailwindcss": "^0.6.12",