Fixup master build

Author: SylvainCorlay

setup.py

@@ -74,6 +74,7 @@ def run(self):
     keywords=['Interactive', 'Interpreter', 'Shell', 'Web'],
     python_requires='>=3.7',
     install_requires=[
+        'importlib-metadata<4;python_version<"3.8.0"',
         'debugpy>=1.0.0',
         'ipython>=7.21.0',
         'traitlets>=4.1.0',