[Python Console] Fix duplicated newline on save (windows)

[YoannQDQ]

Description

When saving a python script on Windows, newlines are duplicated.
This was introduced by #51913

On Windows, QScintilla inserts \r\n whenever the enter key is pressed. Code was previously reliant on the codecs.open, whose default handling of newlines differs from the way io.open, open, or Path does it.

This PR replaces the calls to

Path(name).write_text(text, encoding='utf-8')

with open(name, 'w', encoding='utf-8', newline='') as f:
   f.write(text)

Note: Path did not introduce the newline argument until Python 3.10 so we cannnot use it in this case.

[nicogodet]

Backport 3.30 ?

[YoannQDQ]

Backport 3.30 ?

Definitely