linux: bump default to version 4.18.7

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

linux/Config.in

@@ -120,7 +120,7 @@ endif
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "4.18.5" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "4.18.7" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default "v4.4.138-cip25" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
 		if BR2_LINUX_KERNEL_CUSTOM_VERSION