fix: make AUTHOR_REGEX less restrictive

[finswimmer]

https://packaging.python.org/en/latest/specifications/core-metadata/#author makes no restriction to the Author name. So this PR makes the regex less restrictive. It also removes a duplication of the regex.

Resolves: https://github.com/python-poetry/poetry/issues/6857 Resolves: https://github.com/python-poetry/poetry/issues/6933

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