fix: avoid npm bug when resolving optional deps

[posva]

this makes the package require vue 2.7 but has no code changes

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[pkg-pr-new]

Open in Stackblitz

pnpm add https://pkg.pr.new/@pinia/nuxt@2841

pnpm add https://pkg.pr.new/pinia@2841

pnpm add https://pkg.pr.new/@pinia/testing@2841

commit: 49d4155

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.84%. Comparing base (31fbff1) to head (49d4155).
Report is 20 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2    #2841      +/-   ##
==========================================
+ Coverage   88.39%   88.84%   +0.44%     
==========================================
  Files          19       19              
  Lines        1439     1434       -5     
  Branches      227      225       -2     
==========================================
+ Hits         1272     1274       +2     
+ Misses        166      158       -8     
- Partials        1        2       +1     

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