build(deps-dev): bump @nuxt/devtools from 1.6.4 to 2.6.4

Bumps [@nuxt/devtools](https://github.com/nuxt/devtools/tree/HEAD/packages/devtools) from 1.6.4 to 2.6.4.
- [Release notes](https://github.com/nuxt/devtools/releases)
- [Changelog](https://github.com/nuxt/devtools/blob/main/CHANGELOG.md)
- [Commits](https://github.com/nuxt/devtools/commits/v2.6.4/packages/devtools)

---
updated-dependencies:
- dependency-name: "@nuxt/devtools"
  dependency-version: 2.6.4
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

packages/nuxt/playground/package.json

@@ -8,7 +8,7 @@
     "prepare": "nuxi prepare"
   },
   "devDependencies": {
-    "@nuxt/devtools": "^1.0.8",
+    "@nuxt/devtools": "^2.6.4",
     "nuxt": "^3.12.4"
   },
   "dependencies": {