somnia v0.8.1

Patch release: native UUID record ids round-trip correctly. Bump to
somnia = "0.8.1" (or keep somnia = "0.8" if you already use a caret range).

Fixed

• UUID record ids no longer deserialize as Key::String("u'…'")
  (#1). SurrealDB serializes native
  UUID record-id keys as table:u'…' over JSON; Key / Thing now recognize
  that wire form (and backtick-quoted keys) and parse them as Key::Uuid.
  Key::render_id also emits the native u'…' form for UUID keys instead of
  backticks, so create/filter/RELATE keep a real uuid key rather than a string
  that only looks like one. Covered by unit tests and a live mem://
  create→select regression.