chore(deps): update dependency ajv to v6.12.5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ajv	devDependencies	patch	6.12.4 -> 6.12.5

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Release Notes

ajv-validator/ajv

### [`v6.12.5`](https://togithub.com/ajv-validator/ajv/releases/v6.12.5) [Compare Source](https://togithub.com/ajv-validator/ajv/compare/v6.12.4...v6.12.5) Fix uri scheme validation ([@​ChALkeR](https://togithub.com/ChALkeR)). Fix boolean schemas with strictKeywords option ([#​1270](https://togithub.com/ajv-validator/ajv/issues/1270))

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