{linux, linux-headers}: bump 6.{6, 12}.x series

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

linux/Config.in

@@ -137,7 +137,7 @@ config BR2_LINUX_KERNEL_CUSTOM_REPO_GIT_SUBMODULES
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "6.12.13" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "6.12.15" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default "5.10.162-cip24" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
 	default "5.10.162-cip24-rt10" if BR2_LINUX_KERNEL_LATEST_CIP_RT_VERSION
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \

linux/linux.hash

@@ -1,6 +1,6 @@
 # From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
-sha256  f3ebdeea9e555b4cface44e29670056f4024541e6bd222fbcf776c818974fbba  linux-6.12.13.tar.xz
-sha256  081089dfcf125aef67aa940ebb995ff789b646129f5d4b2365e1d5685b29a84e  linux-6.6.77.tar.xz
+sha256  5ff5bd84ea0e22c53437302db5d394d0a92d8b8b1a88ce20d1098298e9f7630a  linux-6.12.15.tar.xz
+sha256  5aa39a9bd555133ad741058f9908a277e6b36bb928481e747d885b50aaaa93ed  linux-6.6.78.tar.xz
 sha256  874d67d3181570e69ac6b33853f0448f05fc90d4cf3e4baaadc4a9cede7c50f3  linux-6.1.128.tar.xz
 # From https://www.kernel.org/pub/linux/kernel/v5.x/sha256sums.asc
 sha256  efe9f7eb5ea4d26cec6290689343e1804eb3b4a88ff5a60497a696fc08157c42  linux-5.15.178.tar.xz

package/linux-headers/Config.in.host

@@ -432,8 +432,8 @@ config BR2_DEFAULT_KERNEL_HEADERS
 	default "5.10.234"	if BR2_KERNEL_HEADERS_5_10
 	default "5.15.178"	if BR2_KERNEL_HEADERS_5_15
 	default "6.1.128"	if BR2_KERNEL_HEADERS_6_1
-	default "6.6.77"	if BR2_KERNEL_HEADERS_6_6
-	default "6.12.13"	if BR2_KERNEL_HEADERS_6_12
+	default "6.6.78"	if BR2_KERNEL_HEADERS_6_6
+	default "6.12.15"	if BR2_KERNEL_HEADERS_6_12
 	default BR2_DEFAULT_KERNEL_VERSION if BR2_KERNEL_HEADERS_VERSION
 	default "custom"	if BR2_KERNEL_HEADERS_CUSTOM_TARBALL
 	default BR2_KERNEL_HEADERS_CUSTOM_REPO_VERSION \