Update dependency ajv to v6.15.0 (master)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
ajv (source)	resolutions	minor	6.14.0 -> 6.15.0

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Release Notes

ajv-validator/ajv (ajv)

v6.15.0

Compare Source

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Configuration

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This PR has been generated by Renovate Bot.

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[elasticmachine]

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• Commit: c77ad7c

[github-actions]

💔 All backports failed

Status	Branch	Result
❌	feature-layers	Cherrypick failed because the selected commit (595b7db) is empty. Did you already backport this commit?

Manual backport

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backport --pr 658

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