fs-uae: 2.8.3 -> 2.8.4 (#37295)

Semi-automatic update generated by https://github.com/ryantm/nix-update tools. These checks were done:

- built on NixOS
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae --help` got 0 exit code
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae --version` and found version 2.8.4
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae --help` and found version 2.8.4
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae-device-helper -h` got 0 exit code
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae-device-helper --help` got 0 exit code
- ran `/nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4/bin/fs-uae-device-helper help` got 0 exit code
- found 2.8.4 with grep in /nix/store/4n2cnrh2bq910wk4rlk1v7swjwhgq9jq-fs-uae-2.8.4
- directory tree listing: https://gist.github.com/6996324bf1e34d7108f74089af68c981