chore(deps-dev): bump postcss in /motoko/encrypted-notes-dapp

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.5 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.5...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

motoko/encrypted-notes-dapp/package-lock.json

@@ -36,7 +36,7 @@
     "babel-jest": "^27.4.6",
     "daisyui": "^1.25.4",
     "jest": "^27.4.7",
-    "postcss": "^8.4.5",
+    "postcss": "^8.4.31",
     "rollup": "^2.3.4",
     "rollup-plugin-css-only": "^3.1.0",
     "rollup-plugin-inject": "^3.0.2",