variants (aws-dev): use the 6.18 kernel

Signed-off-by: Vighnesh Maheshwari <vighmah@amazon.com>

Author: vigh-m

variants/aws-dev/Cargo.toml

@@ -30,7 +30,7 @@ kernel-parameters = [
 included-packages = [
 # core
     "release",
-    "kernel-6.12",
+    "kernel-6.18",
     "containerd-2.1",
     "systemd-257",
     "nftables",