Motivation for this change

Reprise of #100769. 7e9c623 “linux: 5.8.17 -> 5.8.18” updated the kernel without updating the corresponding linux-hardened patch. The old one no longer applies, which broke the channel-blocking test nixos.tests.latestKernel.hardened.

Update the linux-hardened patches using pkgs/os-specific/linux/kernel/update.sh.

Cc @NeQuissimus. Is there a process improvement to be made so this doesn’t happen or doesn’t block channels? It doesn’t do much good to update the kernel if the failure to apply hardening patches blocks the channel and prevents users from actually getting the kernel update.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.