zsh-autosuggestions: 0.4.0 -> 0.4.2

Semi-automatic update. These checks were performed:

- built on NixOS
- found 0.4.2 with grep in /nix/store/pgilg1imys99x1i42dslrv4qvqkp0p4d-zsh-autosuggestions-0.4.2
- found 0.4.2 in filename of file in /nix/store/pgilg1imys99x1i42dslrv4qvqkp0p4d-zsh-autosuggestions-0.4.2

cc "@loskutov"