chore(deps): bump zod and next in /docs

[dependabot[bot]]

Removes zod. It's no longer used after updating ancestor dependency next. These dependencies need to be updated together.

Removes zod

Updates next from 13.4.16 to 13.5.6

Commits

• 9051bc4 v13.5.6
• a9e796e update version script
• 70f93bf update ci config
• 7db2ce3 Upgrade edge-runtime/cookies (#57021)
• 40965eb Patch React with fix for write-after-close for ReadableStream (#57011)
• 54145b4 v13.5.5
• 1609da2 v13.5.5-canary.19
• 8a51ebc Revert "feat(turbopack): support basic next/dynamic" (#56885)
• c1c419f v13.5.5-canary.18
• 4e435e2 Skip webpack specific tests in Turbopack test run (#56877)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like these dependencies are no longer a dependency, so this is no longer needed.