packaging/dependencies.nix: update nlohmann_json

To illustrate the #13046
problem I'm updating `nlohmann_json` package.

Author: trofi

packaging/dependencies.nix

@@ -102,4 +102,18 @@ scope: {
             ./patches/libgit2-packbuilder-callback-interruptible.patch
           ];
       });
+
+      # Illustrate the failure for `nlohmann_json` update:
+      #   https://github.com/NixOS/nix/issues/13046
+      # It exposes `nix` bug in getInteger() where underlying
+      # json representation is unsigned.
+      nlohmann_json = pkgs.nlohmann_json.overrideAttrs (oa: {
+        src = pkgs.fetchFromGitHub {
+          owner = "nlohmann";
+          repo = "json";
+          rev = "v3.12.0";
+          hash = "sha256-cECvDOLxgX7Q9R3IE86Hj9JJUxraDQvhoyPDF03B2CY=";
+        };
+        cmakeFlags = oa.cmakeFlags ++ [ "-DCMAKE_INSTALL_INCLUDEDIR=include" ];
+      });
 }