kernel: bump 6.6 to 6.6.73

Changelog: https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.6.73



No patches needed a rebase.

Build system: x86/64
Build-tested: bcm27xx/bcm2712, flogic/xiaomi_redmi-router-ax6000-ubootmod, ramips/tplink_archer-a6-v3
Run-tested: bcm27xx/bcm2712, 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/17687


Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 761b2449)

include/kernel-6.6

-LINUX_VERSION-6.6 = .72
-LINUX_KERNEL_HASH-6.6.72 = feb9e514930d5968daa0b8b5486d3295d1fb2b34accf876207641884d4baef39
+LINUX_VERSION-6.6 = .73
+LINUX_KERNEL_HASH-6.6.73 = d2028db190c201650898be8db1c705e9fe73ab44fc04290b4f7af63514122490