syncthing: 1.13.1 -> 1.14.0

[marsam]

Motivation for this change

https://forum.syncthing.net/t/syncthing-v1-14-0/16430

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.

[r-rmcgibbo]

Result of nixpkgs-review pr 115274 at e773a76 run on aarch64-linux 1

1 package marked as broken and skipped:

• syncthing-gtk

5 packages built:

• qsyncthingtray
• syncthing
• syncthing-cli
• syncthing-discovery
• syncthing-relay

1 suggestion:

• warning: missing-patch-comment

  Please add a comment on the line above, explaining the purpose of this patch.
  Near pkgs/applications/networking/syncthing/default.nix:21:9:

     |
  21 |         ./add-stcli-target.patch
     |         ^