When you unblock a user, they'll be able to invite you to be a collaborator to their repositories. If they @mention you anywhere on GitHub, you'll receive notifications.
In repositories you own, the user will be able to collaborate normally.
You can unblock a user in your account settings or from the user's profile page.
Unblocking a user in your account settings
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In the upper-right corner of any page, click your profile photo, then click Settings.
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In the "Access" section of the sidebar, select Moderation then click Blocked users.
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Under "Blocked users", next to the user you'd like to unblock, click Unblock.
Unblocking a user from their profile page
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Visit the user's profile page.
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In the left sidebar, below the user's profile information, click Unblock or report user.
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Click Unblock user.
Tip: Settings that were removed when you blocked the user, such as collaborator status, stars, and follows, are not restored when you unblock the user.