I agree with Guus and was about to comment on similar lines.

I would second this. Apart from the non-technical motivation: the XSF's repos are one of the only ones that I still use that use 'master' rather than 'main'. Where my muscle memory previously disliked 'main', it now dislikes 'master'.

My muscle memory, too, has come to expect 'main', and when I see 'master' my first (unfounded) impression is that this is an old repo or some king of legacy project.

We would be far from the first to apply such a change. Tooling has matured well over the years to make the change pretty easy. I hope that this helps to take away most concerns that are of a technical nature.

Adding to this: there are many web pages explaining specifically how to change the "master" to "main", including this one that I found from a quick web search. It seems simple enough: https://www.hanselman.com/blog/easily-rename-your-git-default-branch-from-master-to-main

You are probably all aware that the use of this term has raised controversy in
recent years, as it can be perceived as a reference to slavery (see https://
en.wikipedia.org/wiki/Master%E2%80%93slave_(technology)#Controversy for
instance).

I wasn't aware of that controversy. But if those connotations are indeed there I'd be happy to see the name changed, even on non-technical grounds :)

Best,
Badri