build(deps): bump the all group across 1 directory with 2 updates

Bumps the all group with 2 updates in the /opa-react-demo directory: [postcss](https://github.com/postcss/postcss) and [react-router-dom](https://github.com/remix-run/react-router/tree/HEAD/packages/react-router-dom).


Updates `postcss` from 8.5.1 to 8.5.3
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.1...8.5.3)

Updates `react-router-dom` from 7.1.5 to 7.2.0
- [Release notes](https://github.com/remix-run/react-router/releases)
- [Changelog](https://github.com/remix-run/react-router/blob/main/packages/react-router-dom/CHANGELOG.md)
- [Commits](https://github.com/remix-run/react-router/commits/[email protected]/packages/react-router-dom)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: all
- dependency-name: react-router-dom
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
...

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

opa-react-demo/package.json

@@ -12,11 +12,11 @@
     "@testing-library/react": "^16.2.0",
     "@testing-library/user-event": "^14.6.1",
     "css-select": "^5.1.0",
-    "postcss": "^8.5.1",
+    "postcss": "^8.5.3",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-pixel-grid": "^0.1.2",
-    "react-router-dom": "^7.1.5",
+    "react-router-dom": "^7.2.0",
     "react-scripts": "^5.0.1",
     "resolve-url-loader": "^5.0.0"
   },