Can not remove bot with no commits from Contributors

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In my blog project, I previously tried using a bot, which was added through a PR, and I merged that PR.

Later, I found the bot wasn't useful, so I force-pushed back to the state before adding the bot, and I've made many commits since. However, the bot still appears as a contributor.

I've checked that the bot isn't listed among collaborators and doesn't have any commits. It's been there for a long time and hasn't disappeared by itself.

How can I remove it?

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