chore(deps): update devdependency @unhead/vue to v3

Author: renovate[bot]

package.json

@@ -64,7 +64,7 @@
     "@nuxt/test-utils": "^4.0.0",
     "@types/node": "^24.12.2",
     "@types/semver": "^7.7.1",
-    "@unhead/vue": "^2.1.13",
+    "@unhead/vue": "^3.0.4",
     "@vitest/coverage-v8": "^4.1.3",
     "@vue/test-utils": "^2.4.6",
     "changelogen": "^0.6.2",