Bump ajv from 6.9.2 to 6.12.6 in /year-in-data-with-python/reveal.js#21

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dependabot/npm_and_yarn/year-in-data-with-python/reveal.js/ajv-6.12.6markwk/python4selftrackers:dependabot/npm_and_yarn/year-in-data-with-python/reveal.js/ajv-6.12.6Copy head branch name to clipboard