Bump prettier from 3.9.6 to 3.9.9 in /frontend

Bumps [prettier](https://github.com/prettier/prettier) from 3.9.6 to 3.9.9.
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](https://github.com/prettier/prettier/compare/3.9.6...3.9.9)

---
updated-dependencies:
- dependency-name: prettier
  dependency-version: 3.9.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

frontend/package-lock.json

@@ -73,7 +73,7 @@
         "lint-staged": "^17.5.1",
         "micromark-util-types": "^2.0.3",
         "postcss": "^8.5.28",
-        "prettier": "^3.9.6",
+        "prettier": "^3.9.9",
         "prettier-plugin-tailwindcss": "^0.8.1",
         "tailwindcss": "^4.3.1",
         "tw-animate-css": "^1.4.0",
@@ -10530,9 +10530,9 @@
       }
     },
     "node_modules/prettier": {
-      "version": "3.9.6",
-      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.6.tgz",
-      "integrity": "sha512-OpN0zzVdiaiAhxpuuj5efpIS4sY9j7bY6uR5mnj5yPzGkdkjNKSJeUThPb60Jw29QuAZgA4o+/iB49kFiaBX6g==",
+      "version": "3.9.9",
+      "resolved": "https://registry.npmjs.org/prettier/-/prettier-3.9.9.tgz",
+      "integrity": "sha512-Z/CJHIkdujO/OtN7nXUii0Rf3VT5SRuhjBA82Xvu2XhBUgX3nhP67T0LHceBdQLex7OOFGTox+Q5Yg8Jk2Qivg==",
       "dev": true,
       "license": "MIT",
       "bin": {

frontend/package.json

@@ -90,7 +90,7 @@
     "lint-staged": "^17.5.1",
     "micromark-util-types": "^2.0.3",
     "postcss": "^8.5.28",
-    "prettier": "^3.9.6",
+    "prettier": "^3.9.9",
     "prettier-plugin-tailwindcss": "^0.8.1",
     "tailwindcss": "^4.3.1",
     "tw-animate-css": "^1.4.0",