default or selected kernelversion does not have config value CONFIG_NET_SHAPER.
Result is shown for kernelversion 6.6.75

CONFIG_NET_SHAPER (not configurable)

configname: CONFIG_NET_SHAPER

Linux Kernel Configuration
└─>Networking support
└─>NET_SHAPER
In linux kernel since version 6.13 (release Date: 2025-01-19)  
depends
CONFIG_NET