Upgrading to vitest and pnpm

[jaredwray]

Please check if the PR fulfills these requirements

• Followed the Contributing guidelines.
• Tests for the changes have been added (for bug fixes/features) with 100% code coverage.
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
upgrading to vitest and pnpm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.09%. Comparing base (d1f3cb3) to head (fa65498).

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #294      +/-   ##
===========================================
- Coverage   100.00%   98.09%   -1.91%     
===========================================
  Files            2        3       +1     
  Lines          162      473     +311     
  Branches        38       57      +19     
===========================================
+ Hits           162      464     +302     
- Misses           0        9       +9     

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