kernel: bump 6.12 to 6.12.68

kernel: bump 6.12 to 6.12.68

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.68

All patches automatically rebased.

Build system: x86/64
Build-tested: flogic/glinet_gl-mt6000
Run-tested: flogic/glinet_gl-mt6000

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/21797
(cherry picked from commit 0bd6a895618f4b0b16707dff1cac39302a903355)
Link: https://github.com/openwrt/openwrt/pull/21825
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>