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'@hono/zod-openapi': major
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feat: support Zod v4

Zod OpenAPI has been migrated the Zod version from v3 to v4. As a result, the `zod` in `peerDependencies` has been updated to 4.0.0 or higher.

Although this is not a breaking change, it is a major change, so it is considered a major version upgrade.