support bleach 5, add packaging and tinycss2 dependencies #1755
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References
bleach
unconstrained dependency causes import errors #1754Code Changes
packaging
, which was previously being provided bybleach
tinycss2
[extra]
, sighbleach
5 withtinycss2
bleach
4, with deprecation warningAlternatives
bleach<5
(not great, because security-related)bleach>=5
(not terrible)