workspace: update Linux to 6.6.30

Stable kernel release bump, no notable changes expected.
No known regressions relevant to us according to the regressions list.

Change-Id: I3fdf0248a8f679f9a80fa6c2f510a3f31e374df5
Reviewed-on: https://review.monogon.dev/c/monogon/+/3089
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/WORKSPACE b/WORKSPACE
index 867a99b..ff00eb9 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -175,7 +175,7 @@
 
 linux_external(
     name = "linux",
-    version = "6.6.13",
+    version = "6.6.30",
 )
 
 load("//third_party/linux-firmware:external.bzl", "linux_firmware_external")
diff --git a/third_party/linux/external.bzl b/third_party/linux/external.bzl
index 87a777a..3edd217 100644
--- a/third_party/linux/external.bzl
+++ b/third_party/linux/external.bzl
@@ -19,6 +19,7 @@
 def linux_external(name, version):
     sums = {
         "6.6.13": "88b89e7dd41ead4e3ab1e411c8bb8d592575acf815cf1df3c0dc57e2e882c0bc",
+        "6.6.30": "b66a5b863b0f8669448b74ca83bd641a856f164b29956e539bbcb5fdeeab9cc6",
     }
     http_archive(
         name = name,