kernel: update to v6.6.6

We need this patch for obvious reasons.

Change-Id: I3338e6527a6bbba090584bd9efbeca711a4ab88b
diff --git a/board/czechlight/clearfog/linux.fragment b/board/czechlight/clearfog/linux.fragment
index 59c45ca..e956912 100644
--- a/board/czechlight/clearfog/linux.fragment
+++ b/board/czechlight/clearfog/linux.fragment
@@ -52,4 +52,4 @@
 CONFIG_INPUT_MOUSE=n
 CONFIG_BPF_SYSCALL=y
 
-CONFIG_LOCALVERSION="-8-g589edcf57c57"
+CONFIG_LOCALVERSION="-8-gc7eadc3bd7fb"