Dima Panov c6a4c59a5c databases/py-mysqlclient: Add some gc safety around _mysql__fetch_row ...

- Users of gc.get_referrers() could cause a SystemError to be raised if this function is running in a different python thread.
- While here, take maintainership

Obtained from:	PyMySQL repo

2020-03-28 12:22:18 +00:00

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patch-gitc67dbd41f

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