build(deps-dev): bump postcss

Bumps the npm_and_yarn group in /apps/OpenSign with 1 update: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.4.44 to 8.4.45
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.44...8.4.45)

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

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

Author: dependabot[bot]

apps/OpenSign/package-lock.json

@@ -111,7 +111,7 @@
     "eslint-plugin-react": "^7.34.3",
     "lint-staged": "^15.2.8",
     "mini-css-extract-plugin": "^2.9.1",
-    "postcss": "^8.4.44",
+    "postcss": "^8.4.45",
     "prettier": "^3.3.3",
     "pretty-quick": "^4.0.0",
     "tailwindcss": "^3.4.10",