Update dependency ajv to 6.12.3 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Change
ajv	6.10.0 -> 6.12.3

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
Medium	5.6	CVE-2020-15366	#84

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Configuration

📅 Schedule: Branch creation - "" (UTC), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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