Update setup.cfg

Co-authored-by: Jeremy Tuloup <[email protected]>

Author: davidbrochart

setup.cfg

@@ -49,7 +49,7 @@ include_package_data = True
 packages = find:
 python_requires = >=3.6
 install_requires =
-	jupyter_server>=1.0
+    jupyter_server>=1.0
     prometheus_client
     psutil~=5.6