Allow later jupyterlab-git dependencies (#87)

* Allow later jupyterlab-git dependencies

jupyterlab-git v0.41.0 works with this project and removes 
some deprecation warnings

* Widen dependency tolerance

Include more versions of jupyterlab-git

Co-authored-by: Frédéric Collonval <fcollonval@users.noreply.github.com>

---------

Co-authored-by: Frédéric Collonval <fcollonval@users.noreply.github.com>

setup.cfg

@@ -38,7 +38,7 @@ setup_requires =
 install_requires =
     entrypoints >=0.2.2
     jupyterlab ~=3.0
-    jupyterlab-git >=0.30.0,<0.40.0a0
+    jupyterlab-git >=0.30.0,<0.50.0
 packages = find:
 include_package_data = True
 zip_safe = False