snes9x-gtk: 1.56.1 -> 1.56.2 (#42446)

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/snes9x-gtk/versions.

These checks were done:

- built on NixOS
- Warning: no invocation of /nix/store/dwkaz8igww0j8mvlvbmmia9dqn1zfi4r-snes9x-gtk-1.56.2/bin/snes9x-gtk had a zero exit code or showed the expected version
- Warning: no invocation of /nix/store/dwkaz8igww0j8mvlvbmmia9dqn1zfi4r-snes9x-gtk-1.56.2/bin/.snes9x-gtk-wrapped had a zero exit code or showed the expected version
- 0 of 2 passed binary check by having a zero exit code.
- 0 of 2 passed binary check by having the new version present in output.
- found 1.56.2 with grep in /nix/store/dwkaz8igww0j8mvlvbmmia9dqn1zfi4r-snes9x-gtk-1.56.2
- directory tree listing: https://gist.github.com/9099159d34f80ca08f46e16de03222b7
- du listing: https://gist.github.com/089002406d67da563ace4b09e11494ab