fix: allow module to install pinia alongside

[posva]

This should allow the nuxt module to install pinia if needed

Fix #2820

[netlify]

✅ Deploy Preview for pinia-official canceled.

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[netlify]

✅ Deploy Preview for pinia-playground canceled.

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🔨 Latest commit	37c1848
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[pkg-pr-new]

Open in Stackblitz

npm i https://pkg.pr.new/@pinia/nuxt@2846

npm i https://pkg.pr.new/pinia@2846

npm i https://pkg.pr.new/@pinia/testing@2846

commit: 37c1848

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.60%. Comparing base (e15ae89) to head (37c1848).
Report is 2 commits behind head on v2.

Additional details and impacted files

@@           Coverage Diff           @@
##               v2    #2846   +/-   ##
=======================================
  Coverage   88.60%   88.60%           
=======================================
  Files          19       19           
  Lines        1439     1439           
  Branches      227      227           
=======================================
  Hits         1275     1275           
  Misses        162      162           
  Partials        2        2           

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