Add newsfragment

Author: abravalheri

newsfragments/4309.removal.rst

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+Further adoption of UTF-8 in ``setuptools``.
+This change regards mostly files produced and consumed during the build process
+(e.g. metadata files, script wrappers, automatically updated config files, etc..)
+Although precautions were taken to minimize disruptions, some edge cases might
+be subject to backwards incompatibility.