Communication: sax parser: add flush() after feed() (#556) #569
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This is due to libexpat 2.6 reparse deferral as documented in #556.
Unfortunately ExpatParser doesn't seem to have SetReparseDeferralEnabled(), so we use an explicit flush() call to make sure all handlers are called immediately. We control the source XML.
NOTE: Only available in Python 3.13 and backports.