deps: update ata to v0.8.0

Notable changes:
- $anchor, $dynamicAnchor, $dynamicRef support (42/42 spec tests)
- Recursion depth guard for circular $ref (prevents stack overflow)
- __proto__ key handling in const/enum comparison
- Date format month/day range validation
- 94.2% Draft 2020-12 spec compliance (1156/1227 tests)
- 95.3% @exodus/schemasafe test suite pass rate

Author: mertcanaltin