build(deps-dev): bump postcss (#48)

Bumps the npm_and_yarn group with 1 update in the /src/frontend directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.5.6 to 8.5.10
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.6...8.5.10)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.10
  dependency-type: direct:development
  dependency-group: npm_and_yarn
...

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Author: dependabot[bot]

src/frontend/package.json

@@ -41,7 +41,7 @@
 		"flowbite-svelte-icons": "^2.2.1",
 		"flowbite-typography": "^1.0.5",
 		"mysql2": "^3.14.3",
-		"postcss": "^8.5.6",
+		"postcss": "^8.5.10",
 		"prettier": "^3.6.2",
 		"prettier-plugin-svelte": "^3.4.0",
 		"svelte": "^5.53.5",