[3.9] gh-91810: Fix regression with writing an XML declaration with encoding='unicode' (GH-93426) #93791
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Suppress writing an XML declaration in open files in ElementTree.write()
with encoding='unicode' and xml_declaration=None.
If file patch is passed to ElementTree.write() with encoding='unicode',
always open a new file in UTF-8.
(cherry picked from commit d7db9dc)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com