Fix unable to load jupyter_nbextensions_configurator extension on Notebook 6.x.x#129

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takato1314 wants to merge 1 commit intoJupyter-contrib:masterfrom

takato1314:fix/new_mathjaxutils_ref

Commits on Jan 11, 2021

Fix issue #125 and #126 where Jupyter notebook cannot load the jupyter_nbextensions_configurator extension and displays a blank page when navigate to localhost:8888/nbextensions/
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