feat(leaflet): update compatibility version to >=4.0.0

[Gugustinette]

🔗 Linked issue

nuxt-modules/leaflet#265

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Apparently, when using nuxi to install a module, nuxi will override the compatibility version exported by the module itself using the compatibility version in the yml config here.
That caused nuxi to wrongly report the leaflet module as incompatible in this case.

This kind of PR will probably happen for every module migrating to Nuxt v4 I guess ?

[Gugustinette]

@danielroe done 👍

So the problem came from my usage of ^3.0.0 instead of >=3.0.0 ?

[danielroe]

yes, ^3.0.0 constrains it to only work on v3, not on v2 or v4. >= is probably the safest approach going forward - we can always narrow it down if it's not compatible with a future version

[Gugustinette]

Ok I wasn't aware of that difference, It's quite possible other modules have made the same mistake then 👀