* Prevent UnboundLocalError in very rare situation.
* Close underlying `SocketIO` soon when Connection is closed
for PyPy.
* Fix importing PyMySQL fail on CPython 3.13 when
`getpass.getuser()` raises OSEError.
* Make charset name "utf8" case insensitive.
* `Connection.kill()` uses `KILL` query instead of
`COM_KILL`command to support MySQL 8.4.
* Fix SSL error on CPython 3.13 caused by strict TLS default
setting. https://github.com/PyMySQL/PyMySQL/pull/1198
* Fix auth switch request handling.
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-PyMySQL?expand=0&rev=46
