R pkgdown Multi Version docs

Version updated for insightsengineering/r-pkgdown-multiversion to version v2.4.6.

• This action is used across all versions by 105 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

What’s Changed

• fix: Handle non-availability of pkgdown by @cicdguy in https://github.com/insightsengineering/r-pkgdown-multiversion/pull/24

Full Changelog: https://github.com/insightsengineering/r-pkgdown-multiversion/compare/v2...v2.4.6

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