Update dependency lux-design-system to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
lux-design-system	^5.0.0-beta.6 -> ^6.0.0

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[github-actions]

Container Scanning Status: ✅ Success

ghcr.io/pulibrary/imagecat-rails:pr-267 (debian 12.8)
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Total: 0 (HIGH: 0, CRITICAL: 0)

Oops

[tpendragon]

Footer logo's too big with this update, for some reason.

Ack! Yes, this is why it's a breaking change. Thanks for catching it. I'll update that in LUX tomorrow and cut a new release.