Log Message:
converters/py-zfec: Update to 1.5.7.4

packaging changes: none (3.7 is not in pkgsrc)

* Release 1.5.7.4 (2023-10-23)

** Python 3.7 is no longer supported.
** Python 3.12 is now supported.
** Binary packages for the macOS "universal2" and "arm64" \ 
architectures are now provided.
** The benchmark tool has been ported to Python 3.
** The GIL is now released for zfec.Encoder and zfec.Decoder initialization and \ 
for encode and decode operations.
   This enables multithreaded use of zfec to use multiple CPU cores for \ 
increased aggregate throughput.