Bump postcss from 8.4.39 to 8.4.40

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.39 to 8.4.40.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.39...8.4.40)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -64,7 +64,7 @@
     "eslint": "^8.57.0",
     "eslint-config-next": "^15.0.0-rc.0",
     "eslint-config-prettier": "^9.1.0",
-    "postcss": "^8.4.39",
+    "postcss": "^8.4.40",
     "prettier": "^3.3.3",
     "prettier-plugin-tailwindcss": "^0.6.5",
     "prisma": "^5.17.0",