v9.1.0

What's Changed

• Fix: correct regex for bigint OpenAPI (fixes #381)
• Fix: correct discriminator mapping for nested discriminated unions (#239)
• Feat: Added z.guid(), z.cidrv4(), z.cidrv6(), z.base64url(), z.iso.time() and z.iso.duration() string format support

Full Changelog: v9.0.0...v9.1.0