fix(deps): update dependency ajv to v8.12.0

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ajv (source)	8.11.2 -> 8.12.0

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Release Notes

ajv-validator/ajv

v8.12.0

Compare Source

• fix JTD serialisation (remove leading comma in objects with only optional properties) (#​2190, @​piliugin-anton)
• empty JTD "values" schema (#​2191)
• empty object to work with JTD utility type (#​2158, @​erikbrinkman)
• fix JTD "discriminator" schema for objects with more than 8 properties (#​2194)
• correctly narrow "number" type to "integer" (#​2192, @​JacobLey)
• update Node.js versions in CI to 14, 16, 18 and 19

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