[issue36543] Remove old-deprecated ElementTree features (part 2)

[Miro Hrončok]

Miro Hrončok <miro at hroncok.cz> added the comment:

Some stats: See https://bugzilla.redhat.com/showdependencytree.cgi?id=PYTHON39&hide_resolved=0 and Ctrl+F for cElementTree.

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<https://bugs.python.org/issue36543>
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