rename invalid -> fail

see sveltejs/kit#8012

Author: ul8

snippets/typescript.json

@@ -12,7 +12,7 @@
   },
   "sveltekit+page.server.ts": {
     "body": [
-      "import { error, invalid, redirect } from '@sveltejs/kit'",
+      "import { error, fail, redirect } from '@sveltejs/kit'",
       "import type { PageServerLoad, Actions } from './$$types'",
       "",
       "export const load: PageServerLoad = async function (${1:event}) {",