TST: install GitPython from repo on Cygwin

Signed-off-by: Filipe Laíns <[email protected]>

Author: FFY00

noxfile.py

@@ -46,6 +46,10 @@ def test(session):
     if os.environ.get('GITHUB_ACTIONS') == 'true':
         session.install('pytest-github-actions-annotate-failures')
 
+    # https://github.com/gitpython-developers/GitPython/pull/1455
+    if platform.system().startswith('CYGWIN'):
+        session.install('git+https://github.com/gitpython-developers/GitPython.git')
+
     session.run(
         'pytest',
         '--showlocals', '-vv',