Bump ajv from 6.12.0 to 6.12.6 in /lambdas/add-message#7

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dependabot/npm_and_yarn/lambdas/add-message/ajv-6.12.6allenheltondev/aws-lambda-layer-types:dependabot/npm_and_yarn/lambdas/add-message/ajv-6.12.6Copy head branch name to clipboard