lnav: 0.8.2 -> 0.8.3

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/14wbn5qpd1jxqwwbcjdr7jg9fq9qs659-lnav-0.8.3/bin/lnav -h` got 0 exit code
- ran `/nix/store/14wbn5qpd1jxqwwbcjdr7jg9fq9qs659-lnav-0.8.3/bin/lnav -V` and found version 0.8.3
- ran `/nix/store/14wbn5qpd1jxqwwbcjdr7jg9fq9qs659-lnav-0.8.3/bin/lnav -h` and found version 0.8.3
- found 0.8.3 with grep in /nix/store/14wbn5qpd1jxqwwbcjdr7jg9fq9qs659-lnav-0.8.3
- found 0.8.3 in filename of file in /nix/store/14wbn5qpd1jxqwwbcjdr7jg9fq9qs659-lnav-0.8.3

cc "@dochang"