bump kernel-upstream to 6.18.51

Author: jens-maus

buildroot-external/configs/generic-x86_64.config

@@ -7,7 +7,7 @@ BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_THINROOT_PATH)/board/generic-x86_64
 BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_THINROOT_PATH)/board/generic-x86_64/post-image.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="$(BR2_EXTERNAL_THINROOT_PATH)/board/generic-x86_64"
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.50"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.51"
 BR2_LINUX_KERNEL_DEFCONFIG="x86_64"
 BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_THINROOT_PATH)/kernel/6.18/global.config $(BR2_EXTERNAL_THINROOT_PATH)/kernel/6.18/device-support.config $(BR2_EXTERNAL_THINROOT_PATH)/kernel/6.18/device-support-pci.config $(BR2_EXTERNAL_THINROOT_PATH)/kernel/6.18/security-x86_64.config $(BR2_EXTERNAL_THINROOT_PATH)/kernel/6.18/security.config $(BR2_EXTERNAL_THINROOT_PATH)/board/generic-x86_64/kernel.config"
 BR2_PACKAGE_MESA3D_GALLIUM_DRIVER_CROCUS=y

buildroot-external/patches/linux-headers/linux-headers.hash

@@ -1,3 +1,3 @@
 sha256  4f57f762991ca6455476f2ad9902595abaff1ddd600892c7f0797ecbe2cd1f37  fc20eb4e650bf793bd6b3d804a63b67085c55f08.tar.gz
 sha256  f26e1a7fb1f01005767792706dae81db6de8ee7b8b01881224a1a9a44c277ebb  stable_20250127.tar.gz
-sha256  d2fc041dab4e11d9645e3ba53be058faa52b8ce28a8a97c889bb2cacee170461  linux-6.18.50.tar.xz
+sha256  ba2f60f858bf4d1f929101faa356c93dc8b925b17aaa9f95eabd4627758df613  linux-6.18.51.tar.xz

buildroot-external/patches/linux/linux.hash

@@ -1,3 +1,3 @@
 sha256  4f57f762991ca6455476f2ad9902595abaff1ddd600892c7f0797ecbe2cd1f37  fc20eb4e650bf793bd6b3d804a63b67085c55f08.tar.gz
 sha256  f26e1a7fb1f01005767792706dae81db6de8ee7b8b01881224a1a9a44c277ebb  stable_20250127.tar.gz
-sha256  d2fc041dab4e11d9645e3ba53be058faa52b8ce28a8a97c889bb2cacee170461  linux-6.18.50.tar.xz
+sha256  ba2f60f858bf4d1f929101faa356c93dc8b925b17aaa9f95eabd4627758df613  linux-6.18.51.tar.xz