feat!: a diver's date of birth, phone, emergency contacts and insurances, read from and written to UDDF

[aleskiontherun]

§6.1 gains a diver's born_on, phone, emergency_contacts and insurances, and bounds the Diver's name, username and email; SPEC_REF moves to divejson/divejson#26's squash commit on the specification's main and schema, fixtures and docs are re-vendored from it. The UDDF reader fills the three members UDDF has elements for — <birthdate>, the first <phone> or else <mobilephone>, and each <insurance> — reads an owner recording any of them as a diver even without a name, and keeps its output inside the new bounds: a phone or email past its bound is dropped rather than cut, an insurer's name is capped at 255, and an insurance with an empty <name> is dropped, each reported. The writer emits the same three into <owner> in the XSD's order with dates widened to midnight, and reports emergency_contacts and an insurance's number, which UDDF has no element for.

Verified with pytest, divejson conform fixtures --strict, and .github/scripts/spec_pin.py against a spec checkout.

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