refactor: make vite a default peer

I think this could be breaking in theory, but...
- If you're using the default setup, you're already good.
- If you've customized your Vite version, you probably thought it was a peer.

Author: lishaduck

packages/wxt/package.json

@@ -62,6 +62,9 @@
     "vite-node": "^2.1.4 || ^3.1.2",
     "web-ext-run": "^0.2.4"
   },
+  "peerDependencies": {
+    "vite": "^5.4.19 || ^6.3.4 || ^7.0.0"
+  },
   "devDependencies": {
     "@aklinker1/check": "^2.1.0",
     "@faker-js/faker": "^10.0.0",