ci: downgrade ts

nuxt module builder bug: nuxt/module-builder#141

Author: posva

package.json

@@ -129,7 +129,7 @@
     "tsup": "^8.3.6",
     "typedoc": "^0.27.6",
     "typedoc-plugin-markdown": "^4.4.1",
-    "typescript": "~5.7.3",
+    "typescript": "~5.6.0",
     "vitepress": "1.6.3",
     "vitest": "^3.0.4",
     "vue": "^3.5.13"