nuget-to-json: fix silent error after curl update

[gepbird]

Fixes #389194

Cherry-picked the relevant commits from #389338, as this bug affects everyone who tries to update or add dotnet packages. It can be frustrating and time consuming to track this down for people unaware of this bug, so this should be merged in a timely manner

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[gepbird]

Tested with $(nix-build -A vrcadvert.fetch-deps), exit code is 0 and deps.json gets regenerated

[nixpkgs-ci]

Successfully created backport PR for release-24.11:

• [Backport release-24.11] nuget-to-json: fix silent error after curl update #390936

[r-vdp]

Thanks!