Fix the documentation build by pinning the matplotlib version
To reference or cite the objects present in the Software Heritage archive, permalinks based on SoftWare Heritage persistent IDentifiers (SWHIDs) must be used instead of copying and pasting the url from the address bar of the browser (as there is no guarantee the current URI scheme will remain the same over time).
Select below a type of object currently browsed in order to display its associated SWHID and permalink.
Merge pull request #450 from tensorly/fix-docs
[run] omit = *yaleb.py, *backend* [report] omit = *yaleb.py, *backend*
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