chore: indicate compatibility with new v4 major

[danielroe]

With Nuxt 4 on the horizon, this updates the module compatibility definition to allow it to be installed on Nuxt v4. (Otherwise Nuxt will indicate the module might not be compatible.)

When Nuxt v4 comes out then you might decide or need to make breaking changes in this module and release a new major, but hopefully the migration should be smoother. 🙏

👉 You can follow this and other changes in nuxt/nuxt#27613 - please feel free to provide feedback as well!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.64%. Comparing base (175a568) to head (f2d9c67).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1545   +/-   ##
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  Coverage   74.64%   74.64%           
=======================================
  Files          28       28           
  Lines        3850     3850           
  Branches      264      264           
=======================================
  Hits         2874     2874           
  Misses        976      976           

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