Mirror master and main
Mirror master and main

In preparation for eventually switching over to `main`, let's
synchronize the historical and the designated future main branch.

This follows the excellent advice from
https://github.com/chancancode/branch-rename/#gradual-migration

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

dscho/MINGW-packages,dscho/MINGW-packages,dscho/MINGW-packages,git-for-windows/MINGW-packages,git-for-windows/MINGW-packages,dscho/MINGW-packages,dscho/MINGW-packages,git-for-windows/MINGW-packages