Motivation for this change

Changelog

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• 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 nix-review --run "nix-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)

$ nix path-info -Sh /nix/store/b8ykb9mpzn6jg62w4g1gsmc18vg3iy1w-qtpbfimageplugin-2.0
/nix/store/b8ykb9mpzn6jg62w4g1gsmc18vg3iy1w-qtpbfimageplugin-2.0	 193.5M
$ nix path-info -Sh /nix/store/chbrwmrckrrdn4b7h4m7n8hbws23y3v8-qtpbfimageplugin-2.1
/nix/store/chbrwmrckrrdn4b7h4m7n8hbws23y3v8-qtpbfimageplugin-2.1	197.0M

• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.