nat46: bump to latest git HEAD 2025-04-23

nat46: bump to latest git HEAD 2025-04-23

This new version introduces many compilation error fixes for
the upcoming 6.12 kernel. Changelogs:

04923c5 "Fix build failures observed so far" - take three.
b4263cc "Fix build failures observed so far" - take two.
de595b4 Fix build failures observed so far
1c0066a Zero checksum handling for UDP4->UDP6
b42c37d Fix crash when viewing nat46 kernel module config
3a9f630 nat46-module: fix modpost warning
88b91ca gha: use checkout@v4 action instead of checkout@v2
84ba13a gha: enable github action on push/PR
f367088 fix the compilation error
03c14bf gha: clean-up the yaml definition
d964921 Create c-compile.yml
cb69317  "Add network namespace awareness to nat46" - take two.
8302f42 Revert "Add network namespace awareness to nat46"
91b8e68 Add network namespace awareness to nat46

Signed-off-by: Shiji Yang <[email protected]>