Bump pnpm/action-setup from 4 to 6

Sourced from pnpm/action-setup's releases.

v6.0.0

Added support for pnpm v11.

v5.0.0

Updated the action to use Node.js 24.

v4.4.0

Updated the action to use Node.js 24.

v4.3.0

What's Changed

• docs: fix the run_install example in the Readme by @​dreyks in pnpm/action-setup#175
• chore: remove unused @types/node-fetch dependency by @​silverwind in pnpm/action-setup#186
• Clarify that package_json_file is relative to GITHUB_WORKSPACE by @​chris-martin in pnpm/action-setup#184
• feat: store caching by @​jrmajor in pnpm/action-setup#188
• refactor: remove star imports by @​KSXGitHub in pnpm/action-setup#196
• fix(ci): exclude macos by @​KSXGitHub in pnpm/action-setup#197

New Contributors

• @​dreyks made their first contribution in pnpm/action-setup#175
• @​silverwind made their first contribution in pnpm/action-setup#186
• @​chris-martin made their first contribution in pnpm/action-setup#184
• @​jrmajor made their first contribution in pnpm/action-setup#188
• @​Boosted-Bonobo made their first contribution in pnpm/action-setup#199

Full Changelog: https://github.com/pnpm/action-setup/compare/v4.2.0...v4.3.0

v4.2.0

When there's a .npmrc file at the root of the repository, pnpm will be fetched from the registry that is specified in that .npmrc file #179

v4.1.0

Add support for package.yaml #156.

• 26f6d4f fix: use npm co-located with the action node binary (#239)
• 903f9c1 fix: update pnpm to 11.0.0-rc.5
• bdf0af2 test: add strict version-match jobs to reproduce #225 / #227
• 71c9247 fix: pnpm self-update binary shadowed by bootstrap on PATH (#230)
• 078e9d4 fix: update pnpm to 11.0.0-rc.2
• 08c4be7 docs(README): update action-setup version
• 5798914 chore: update .gitignore
• ddffd66 fix: remove accidentally committed file
• b43f991 fix: update pnpm to 11.0.0-rc.0
• 3852509 README.md: bring versions up-to-date (#222)
• Additional commits viewable in compare view

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