linux: bump default to version 4.18.4

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

linux/Config.in

@@ -120,7 +120,7 @@ endif
 
 config BR2_LINUX_KERNEL_VERSION
 	string
-	default "4.18.3" if BR2_LINUX_KERNEL_LATEST_VERSION
+	default "4.18.4" if BR2_LINUX_KERNEL_LATEST_VERSION
 	default "v4.4.130-cip23" if BR2_LINUX_KERNEL_LATEST_CIP_VERSION
 	default BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE \
 		if BR2_LINUX_KERNEL_CUSTOM_VERSION