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Tk provides tk_dialog that is compatible across 8.6 and 9.0 and handles git-gui--askyesno requirements. The latter is not compatible with Tk 9.0, so let's use tk_dialog.
Note: this is a single commit on top of js/ask-yesno, the latter is not merged to master. I'm leaving this as a draft, the commit should probably be cherry-picked, and as I'm not using g4w and experiencing the need for this dialog, more testing is needed that I cannot really provide. This does work for me on Linux invoked from the command line on Tcl 8.6, 8.7, and 9.0.