workspace: update linux to 6.1.69

Change-Id: Ia2e8442f7d4780c8f34b2e4a10f30f47222f9fbc
Reviewed-on: https://review.monogon.dev/c/monogon/+/2595
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/WORKSPACE b/WORKSPACE
index dfc75fd..a40bf19 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -194,7 +194,7 @@
 
 linux_external(
     name = "linux",
-    version = "6.1.56",
+    version = "6.1.69",
 )
 
 load("//third_party/linux-firmware:external.bzl", "linux_firmware_external")