palemoon: 27.7.2 -> 27.8.0

Semi-automatic update. These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 27.8.0 with grep in /nix/store/vqardwl9d7s3wdgapj4ybzrgpw5w3671-palemoon-27.8.0