ci: bump amazonlinux/linux kernel tags

5.10: microvm-kernel-5.10.257-293.1015.amzn2 → microvm-kernel-5.10.259-299.1043.amzn2
6.1:  microvm-kernel-6.1.172-36.328.amzn2023  → microvm-kernel-6.1.176-43.358.amzn2023

Author: github-actions[bot]

scripts/build-kernel.sh

@@ -34,8 +34,8 @@ ARCH_IN="$2"
 OUT_DIR="${3:-dist/kernel}"
 
 case "$VERSION" in
-  5.10) TAG="microvm-kernel-5.10.257-293.1015.amzn2" ;;
-  6.1)  TAG="microvm-kernel-6.1.172-36.328.amzn2023" ;;
+  5.10) TAG="microvm-kernel-5.10.259-299.1043.amzn2" ;;
+  6.1)  TAG="microvm-kernel-6.1.176-43.358.amzn2023" ;;
   *)
     echo "unknown version $VERSION (want 5.10 or 6.1)" >&2
     exit 64