kernel: bump 6.6 to 6.6.56

kernel: bump 6.6 to 6.6.56

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.56

No patches needed a rebase

Build system: x86/64
Build-tested: x86/64/AMD Cezanne, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3
Run-tested: x86/64/AMD Cezanne, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3

Signed-off-by: John Audia <therealgraysky@proton.me>
Link: https://github.com/openwrt/openwrt/pull/16655
Signed-off-by: Nick Hainke <vincent@systemli.org>