Update pnpm/action-setup action to v6.0.4

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change	Pending
pnpm/action-setup	action	patch	v6.0.3 -> v6.0.4	v6.0.8 (+3)

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Release Notes

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

v6.0.4

Compare Source

What's Changed

• fix: use npm co-located with the action node binary by @​benquarmby in https://github.com/pnpm/action-setup/pull/239

New Contributors

• @​benquarmby made their first contribution in https://github.com/pnpm/action-setup/pull/239

Full Changelog: pnpm/action-setup@v6.0.3...v6.0.4

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