Update withastro/action action to v6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
withastro/action	action	major	v5.2.0 → v6.1.1

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Release Notes

withastro/action (withastro/action)

v6.1.1

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• Pin upload-pages-artifact to v5 SHA @​KyleChamberlin (#​102)

See details of all code changes since previous release.

v6.1.0

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• Use upload-pages-artifact action again @​delucis (#​101)

See details of all code changes since previous release.

v6.0.0

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• chore(action): update dependencies for Node, PNPM, Bun, and cache actions @​ollecoffee (#​96)

See details of all code changes since previous release.

v6

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