[3.12] gh-127847: Fix position in the special-cased zipfile seek (GH-127856) (#128226)

gh-127847: Fix position in the special-cased zipfile seek (GH-127856)

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(cherry picked from commit 7ed6c5c6961d0849f163d4d449fb36bae312b6bc)

Co-authored-by: Dima Ryazanov <dima@bucket.xxx>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>