chore(deps-dev): bump postcss from 8.5.13 to 8.5.23 (#2231)

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

Author: dependabot[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "markdown-it-prism": "^3.0.0",
     "netlify-plugin-cache": "^1.0.3",
     "pagefind": "^1.2.0",
-    "postcss": "^8.5.13",
+    "postcss": "^8.5.23",
     "postcss-cli": "^11.0.1",
     "postcss-import": "^16.1.1",
     "postcss-import-ext-glob": "^2.1.1",