chore(deps): update dependency ajv to v6.12.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ajv	devDependencies	minor	6.10.2 -> 6.12.4

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Release Notes

ajv-validator/ajv

### [`v6.12.4`](https://togithub.com/ajv-validator/ajv/releases/v6.12.4) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.12.3...v6.12.4) Fix: coercion of one-item arrays to scalar that should fail validation ([failing example](https://runkit.com/esp/5f3672ba2f6642001ae27411)). ### [`v6.12.3`](https://togithub.com/ajv-validator/ajv/releases/v6.12.3) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.12.2...v6.12.3) Pass schema object to processCode function Option for strictNumbers ([@​issacgerges](https://togithub.com/issacgerges), [#​1128](https://togithub.com/ajv-validator/ajv/issues/1128)) Fixed vulnerability related to untrusted schemas ([CVE-2020-15366](https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=CVE-2020-15366)) ### [`v6.12.2`](https://togithub.com/ajv-validator/ajv/releases/v6.12.2) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.12.1...v6.12.2) Removed post-install script ### [`v6.12.1`](https://togithub.com/ajv-validator/ajv/releases/v6.12.1) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.12.0...v6.12.1) Docs and dependency updates ### [`v6.12.0`](https://togithub.com/ajv-validator/ajv/releases/v6.12.0) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.11.0...v6.12.0) Improved hostname validation ([@​sambauers](https://togithub.com/sambauers), [#​1143](https://togithub.com/ajv-validator/ajv/issues/1143)) Option `keywords` to add custom keywords ([@​franciscomorais](https://togithub.com/franciscomorais), [#​1137](https://togithub.com/ajv-validator/ajv/issues/1137)) Types fixes ([@​boenrobot](https://togithub.com/boenrobot), [@​MattiAstedrone](https://togithub.com/MattiAstedrone)) Docs: - [error logging](https://togithub.com/epoberezkin/ajv#error-logging) example ([@​RadiationSickness](https://togithub.com/RadiationSickness)) - TypeScript usage notes ([@​thetric](https://togithub.com/thetric)) ### [`v6.11.0`](https://togithub.com/ajv-validator/ajv/releases/v6.11.0) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.10.2...v6.11.0) Time formats support two digit and colon-less variants of timezone offset ([#​1061](https://togithub.com/ajv-validator/ajv/issues/1061) , [@​cjpillsbury](https://togithub.com/cjpillsbury)) Docs: RegExp related security considerations Tests: Disabled failing typescript test

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