3.14 is no longer supported upstream by kernel.org and thus no longer
receives security patches. The git commit mentioned in this .nix isn't
even available in the linked repository --
https://chromium.googlesource.com/chromiumos/third_party/kernel -- so I
think this .nix might be dead anyway. Finally, it specifies 3.14.0,
which is so ridiculously old (the latest was 3.14.79) that nobody
develops for it.
Fixes: #25145
Supports: #25127
