Bump ajv from 6.5.5 to 6.12.6 in /lib/darkmode-js#39

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dependabot/npm_and_yarn/lib/darkmode-js/ajv-6.12.6SunYanCN/sunyancn.github.io:dependabot/npm_and_yarn/lib/darkmode-js/ajv-6.12.6Copy head branch name to clipboard