fix: devtools package is importing from undeclared dependency `unstorage`

[loilo]

🐛 The bug

The following has been reported when reinstalling my dependencies in Nuxt today, as part of the nuxt prepare command:

From what I can tell, this problem has been introduced in 902c60c, when functions from unstorage were first imported without declaring it a dependency.

🛠️ To reproduce

🌈 Expected behavior

The error should never happen because in every case, either unstorage would be installed directly inside node_modules (probably the case for 99% of users) or inside node_modules/@nuxt/devtools/node_modules (cannot happen because of missing dependency).

ℹ️ Additional context

Unfortunately, I am not able to provide a clean minimal reproduction since in all fresh Nuxt projects I'm setting up, unstorage is always deduped, so it ends up in node_modules as a dependency of a different package (e.g. @nuxt/nitro-server, which is probably why this has not happened to anyone else yet):

My own dependency tree looks like this, with unstorage not being deduped (for reasons unknown to me), and therefore not ending up directly inside node_modules at all: