chore(deps): update pnpm/action-setup action to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pnpm/action-setup	action	major	v4 → v5

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Release Notes

pnpm/action-setup (pnpm/action-setup)

v5

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Latest commit: c3f205e

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[github-actions]

size-limit report 📦

Path	Size
packages/openapi-fetch/dist/index.mjs	7.03 KB (0%)

[gzm0]

LGTM. Release notes say this just updates node to 24.

https://github.com/pnpm/action-setup/releases/tag/v5.0.0

(and in fact, 4.4.0 also uses 24 already: https://github.com/pnpm/action-setup/releases/tag/v4.4.0)