jags: 4.1.0 -> 4.3.0

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:
- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 4.3.0 with grep in /nix/store/aw897502z5bcn6dw6rp7jca90flfrjab-JAGS-4.3.0