nat46: fix reproducible-build failure and use latest git

nat46: fix reproducible-build failure and use latest git

Bump to 2025-11-04 snapshot.

Added 100-gcc15-fix.patch which drops __DATE__/__TIME__ usage and provides
a stable fallback ("unknown"). This fixes build failures with GCC 15 and
-Werror=date-time in kernel builds.

% git log --oneline 04923c5..adb2f72
adb2f72e6fb8 get rid of spurious ubsan complaint for nat46_instance_t pairs field
d5f88686a4a8 Add a test harness which boots the kernel under kvm with a custom init which runs the tests
b983bab221f0 nat46-core: Fix FIXMEs about ICMPv6 parameter pointers
1aca482d6917 Add support for ignoring traffic class or TOS translation at the same time

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/21284
[Removed "Replace printk with pr_* macros" patch]
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>