Queers should hide definitely isn't any social default unless the code is exclusively developed in Gaza. "Do what you like but please stick to technical considerations" isn't "you need to hide".
That doesn't mean that "Please stick to technical considerations" or quite simply "that's off-topic" are never valid. They very much are. It simply means that they don't provide some clean clear demarcation line around which to organize a technical community.
There's no single societal norm in worldwide source projects; that's just you monolithing a diverse set of groups. In this particular instance if you're just a GitHub handle then whether you're female or you wish to be called "her" then that doesn't require hiding that you're "queer", but it also doesn't require mentioning it. Just say, "actually it's 'she'" and you're done.