kernel: bump 6.12 to 6.12.73

kernel: bump 6.12 to 6.12.73

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.12.73

No patches rebased/checksum update only.

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/22191
Signed-off-by: Robert Marko <robimarko@gmail.com>
(cherry picked from commit 3c1e45a39fb63bd5e2b55436f3e5fad36f2899b9)
Link: https://github.com/openwrt/openwrt/pull/22314
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>