mutt: 1.9.0 -> 1.9.1

[matthiasbeyer]

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • Linux
• 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/)
• Fits CONTRIBUTING.md.

[mention-bot]

@matthiasbeyer, thanks for your PR! By analyzing the history of the files in this pull request, we identified @abbradar, @rnhmjoj and @kosmikus to be potential reviewers.

[matthiasbeyer]

wow that was fast. Thanks a lot!