build: update ajv to version 6.8.1

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change	References
ajv	dependencies	minor	6.7.0 -> 6.8.1	source
ajv	devDependencies	minor	6.7.0 -> 6.8.1	source

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Release Notes

epoberezkin/ajv

v6.8.1

Compare Source

v6.8.0

Compare Source

Docs: security considerations.
Meta-schema for the security assessment of JSON Schemas.

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