Update git flow to >= 1.12.0

[dazinator]

• I was not able to find an open or closed issue matching what I'm seeing

Setup

Please consider updating git glow to >= 1.12.0 as there has been some issues fixed that make working with PR's less probelmatic: petervanderdoes/gitflow-avh#330

[rimrul]

This should be in upcomming Git for Windows versions due to msys2/MSYS2-packages/pull/1555.
Edit: I think I'm wrong. We might need to cherry-pick those changes into git-for-windows/MSYS2-packages

[rimrul]

This is now in upcomming Git for Windows versions as of 72bd7beced.