Motivation for this change

Mediathekview has been out of date for a while. The project has its own website now https://mediathekview.de/ (warning its in german). This is my first contribution to nixpkgs so I appologize for any inconvenience in advance. I also know that this is a litte bit of a niche thing.

Things done

Upgrade is from version 9 to 13.2.1. I also took the liberty to switch us to tar, since both releases are available. Further I specified oraclejre, instead of jre to avoid issues.
I kept the maintainer as is.

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • [ x ] NixOS
  • macOS
  • [ x ] 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 nox --run "nox-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)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.