Bump ajv from 6.7.0 to 6.12.6 in /Slack-Clone-Server#25

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dependabot/npm_and_yarn/Slack-Clone-Server/ajv-6.12.6devandres-tech/Slack-Clone:dependabot/npm_and_yarn/Slack-Clone-Server/ajv-6.12.6Copy head branch name to clipboard