net/nmsg: Upgrade to version 1.4.0

nmsg (1.4.0):

• Removed nmsgtool support for presentation inputs.
• Properly handle fragmented containers in zmq/kafka inputs.
• Support single nmsg payload kafka in/out sources.
• Clean-up temp files after failed start using -w.
• Improved warning for mismatched CRC.
• Require json-c build dependency.
• Fix various small memory leaks and mismanagement issues.
• Fix strict aliasing violations.
• Removal of various unused header files.
• Various documentation fixes.

MFH: 2026Q3
Sponsored by: DomainTools LLC

(cherry picked from commit 5e7bf40e64c4a67d87e7b77cee87ec0634ecb704)