build(deps): bump the npm_and_yarn group

Bumps the npm_and_yarn group in /apps/OpenSign with 2 updates: [postcss](https://github.com/postcss/postcss) and [http-proxy-middleware](https://github.com/chimurai/http-proxy-middleware).


Updates `postcss` from 8.4.47 to 8.4.48
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.47...8.4.48)

Updates `http-proxy-middleware` from 2.0.6 to 2.0.7
- [Release notes](https://github.com/chimurai/http-proxy-middleware/releases)
- [Changelog](https://github.com/chimurai/http-proxy-middleware/blob/v2.0.7/CHANGELOG.md)
- [Commits](chimurai/http-proxy-middleware@v2.0.6...v2.0.7)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  dependency-group: npm_and_yarn
- dependency-name: http-proxy-middleware
  dependency-type: indirect
  dependency-group: npm_and_yarn
...

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

Author: dependabot[bot]

apps/OpenSign/package-lock.json

@@ -113,7 +113,7 @@
     "eslint-plugin-react": "^7.37.1",
     "lint-staged": "^15.2.10",
     "mini-css-extract-plugin": "^2.9.1",
-    "postcss": "^8.4.47",
+    "postcss": "^8.4.48",
     "prettier": "^3.3.3",
     "pretty-quick": "^4.0.0",
     "tailwindcss": "^3.4.13",