build: Raise ajv dependency from 8.6.2 to 8.12.0
Nothing alarming in upstream change log:
https://github.com/ajv-validator/ajv/compare/v8.6.2...v8.12.0
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Nothing alarming in upstream change log:
https://github.com/ajv-validator/ajv/compare/v8.6.2...v8.12.0