📝 Update CONTRIBUTING.md after switch to pnpm

[gruhn]

Description

The CONTRIBUTING.md was still mentioning yarn commands. I changed them all to pnpm. At least this is my best guess interpretation. I also did a quick grep over the whole repo with remaining mentions of yarn. I think most are in changelogs or on the website but not related to workflow in this repo.

Checklist — Don't delete this checklist and make sure you do the following before opening the PR

• The name of my PR follows gitmoji specification
• My PR references one of several related issues (if any)
  • New features or breaking changes must come with an associated Issue or Discussion
  • My PR does not add any new dependency without an associated Issue or Discussion
• My PR includes bumps details, please run pnpm run bump and flag the impacts properly
• My PR adds relevant tests and they would have failed without my PR (when applicable)

Advanced

• Category: 📝 Add or update documentation
• Impacts: -

[changeset-bot]

🦋 Changeset detected

Latest commit: cc9d1dd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
fast-check
@fast-check/ava	Patch
@fast-check/jest	Patch
@fast-check/vitest	Patch
@fast-check/worker	Patch

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Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

Open in Stackblitz • @fast-check/examples

@fast-check/ava

npm i https://pkg.pr.new/@fast-check/ava@5774

@fast-check/expect-type

npm i https://pkg.pr.new/@fast-check/expect-type@5774

fast-check

npm i https://pkg.pr.new/fast-check@5774

@fast-check/jest

npm i https://pkg.pr.new/@fast-check/jest@5774

@fast-check/packaged

npm i https://pkg.pr.new/@fast-check/packaged@5774

@fast-check/vitest

npm i https://pkg.pr.new/@fast-check/vitest@5774

@fast-check/poisoning

npm i https://pkg.pr.new/@fast-check/poisoning@5774

@fast-check/worker

npm i https://pkg.pr.new/@fast-check/worker@5774

commit: cc9d1dd

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.73%. Comparing base (b89d401) to head (cc9d1dd).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5774      +/-   ##
==========================================
+ Coverage   94.49%   94.73%   +0.23%     
==========================================
  Files         212      212              
  Lines        9623    10057     +434     
  Branches     2670     2669       -1     
==========================================
+ Hits         9093     9527     +434     
  Misses        530      530              

Flag	Coverage Δ
unit-tests	94.73% <ø> (+0.23%)	⬆️
unit-tests-18.x-Linux	94.73% <ø> (+0.23%)	⬆️
unit-tests-20.x-Linux	94.73% <ø> (+0.23%)	⬆️
unit-tests-22.x-Linux	94.73% <ø> (+0.23%)	⬆️
unit-tests-latest-Linux	94.73% <ø> (+0.23%)	⬆️

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[dubzzz]

Thanks for the fix