chore(deps): update pnpm to v8 (#120)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Diff for: package.json

@@ -3,7 +3,7 @@
   "version": "0.13.4",
   "homepage": "https://github.com/nuxtlabs/studio.nuxt.com/tree/dev/modules/studio",
   "repository": "https://github.com/nuxtlabs/studio.nuxt.com",
-  "packageManager": "pnpm@7.30.1",
+  "packageManager": "pnpm@8.7.1",
   "keywords": [
     "nuxt",
     "studio"