Remove outdated method='c14n' references from ElementTree

[danifus]

Feature or enhancement

Proposal:

Remove some unused code and docstring descriptions.

Some references to a removed c14n serialization method remained in ElementTree.py. Attempting to use method='c14n' in the write() method would result in ValueError: unknown method 'c14n'.

Removes the write_c14n() method that uses method='c14n' and also raises the same error.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-118318: Remove outdated c14n references from ElementTree #118319