ci(github-actions): update pnpm/action-setup action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
pnpm/action-setup	action	major	v4 → v6

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Release Notes

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

v6

Compare Source

v5

Compare Source

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[github-actions]

📊 Package size report   No changes

File	Before (Size / Gzip)	After (Size / Gzip)
Total (Includes all files)	36.2 kB / 14.9 kB	36.2 kB / 14.9 kB
Tarball size	12.5 kB	0.03%↑12.5 kB

Unchanged files

File	Size (Size / Gzip)
dist/index.cjs	3.4 kB / 1.8 kB
dist/index.d.ts	6.5 kB / 2.3 kB
dist/index.mjs	3.4 kB / 1.8 kB
LICENSE	1.1 kB / 667 B
package.json	1.4 kB / 635 B
README.md	14.7 kB / 5.2 kB
skills/type-flag/SKILL.md	5.6 kB / 2.6 kB

_{🤖 This report was automatically generated by pkg-size-action}

[renovate]

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