Fix off-by-one in OTOC normalization

This release fixes an off-by-one error in OTOC normalization. (This form of the code looks like it might be ready to attempt validation, come Monday.)

Full Changelog: v9.3.7...v9.3.8

sha1sum results:
1adff49f97b97edbf533c49a25c38051ccf7b646 pyqrackising-9.3.8-py3-none-macosx_14_0_arm64.whl
fdb682de52ed27c5619bd06e1004e8964816753e pyqrackising-9.3.8-py3-none-macosx_15_0_arm64.whl
1024cf5f734da813d27ba45415c28cc6f65f9f06 pyqrackising-9.3.8-py3-none-manylinux_2_35_x86_64.whl
83b9cd94f2548f26a01756392a06d7d97ae42178 pyqrackising-9.3.8-py3-none-manylinux_2_39_x86_64.whl
f5fbd9ff3e9c494b7a285781704c9150ae5923f6 pyqrackising-9.3.8-py3-none-win_amd64.whl
b6e53d9b62e66721c044402420d42d26cb06f8b5 pyqrackising-9.3.8.tar.gz