[3.12] GH-105808: Fix a regression introduced in GH-101251 (GH-105910) #105920
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Fix a regression introduced in GH-101251, causing GzipFile.flush() to
not flush the compressor (nor pass along the zip_mode argument).
(cherry picked from commit 1858db7)
Co-authored-by: T. Wouters thomas@python.org