How can one close issues fransferred from Bugzilla

[Quirin Schroll]

For example, I originally filed 
[DMD#19271](https://github.com/dlang/dmd/issues/19271), but as 
far as GitHub is concerned, I’m not the author of that issue so I 
can’t close it.

What’s the process for that? I can comment on that issue, but how 
would anyone know I did?