Convert old buffer protocols to Python 3 buffer protocol

[eclipseo]

Old Python 2.x buffer protocols were removed in Python 3.13"

Ref: https://docs.python.org/3.13/whatsnew/3.13.html

Fix: #93

Tested here:

3.13 beta-2: https://koji.fedoraproject.org/koji/taskinfo?taskID=119375328 3.12: https://koji.fedoraproject.org/koji/buildinfo?buildID=2477205