Update package version to 6.18.21

pkg.info

@@ -1,6 +1,6 @@
 name: linux-lts
 description: The longterm support version of the linux kernel
-version: 6.18.19
+version: 6.18.21
 revision: 1
 url: https://www.kernel.org/
 license: GPL2-only
@@ -24,7 +24,7 @@ downloads:
   - url: https://cdn.kernel.org/pub/linux/kernel/v${BPM_PKG_VERSION%%.*}.x/linux-${BPM_PKG_VERSION}.tar.xz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: eaaf78271cd07c68ad9c4c9a70c72718b33abbd716239d82bac96b1751eb090c
+    checksum: 1c38214fb137bae85b82b82537b5987358621b915ab2a8e4f09e60697c19474f
 split_packages:
   - name: linux-lts
     optional_depends: