[3.12] gh-129726: Break gzip.GzipFile reference loop (GH-130055)
          #130670
        
          
      
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A reference loop was resulting in the
fileobjheld by theGzipFilebeing closed before the
GzipFile.The issue started with gh-89550 in 3.12, but was hidden in most cases
until 3.13 when gh-62948 made it more visible.
(cherry picked from commit 7f39137)
Co-authored-by: Cody Maloney [email protected]