chore(docs): bump docs-kit to d75a50b

[mhenrixon]

Summary

Bumps the pinned docs-kit revision f331b15 → d75a50b. Picks up the
eager-load Stimulus fix + importmap doc, the SECRET_KEY_BASE new-site template
default, and the expanded docs-kit docs (docs-kit's own pages; no effect here).

Lockfile-only change.

Test plan

• CI=true bundle exec rspec spec/requests spec/system — 8 green (eager_load on)
• bin/rubocop — clean (345 files)
• bun run build:css rebuilds the daisyUI CSS

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