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Jekyll only adds that if you use their “SEO” plugin: https://github.com/jekyll/jekyll-seo-tag/blob/0943563d0aac60.... (I don’t use that plugin, so I add it manually to mine.)
If I'm not mistaken, Jekyll also adds it in the RSS feed metadata, if you use that plugin, but that's already a bit far fetched.
I checked my own site which is built with Hugo and that's what it uses

<meta name="generator" content="Hugo 0.56.3">