It's important to draw the distinction between the usage of the term to
(1) describe oneself and one's peers and create an ingroup
as opposed to
(2) describe (and often criticize) others
I don't see a lot of unironic usage of (1), aside from the odd tone-deaf fratboy.
I see a lot of criticism of "brogrammers" and "dudebros" by self-styled "progressives" on the internet and social media.
The question is, what is the actual intent of this project name - is it just a "ha-ha, man refers to male people, bro is a different word to refer to male people"? If so, then there's no problem with it and people offended by it are overreacting.
If it's intended to exclude females from contributing or participating (though I don't see how), then that's a problem. It's not clear that this would actually be an issue - a man who didn't want to participate in a project because the gem was called "estrogen" or "sister" or something would rightly be criticized for having some issues.