spidermonkey_52: 52.8.0 -> 52.8.1

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

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

These checks were done:

- built on NixOS
- /nix/store/4rnqlff4g9vx7ci5b0a6936h9ffk4l8x-spidermonkey-52.8.1/bin/js52 passed the binary check.
- /nix/store/4rnqlff4g9vx7ci5b0a6936h9ffk4l8x-spidermonkey-52.8.1/bin/js52-config passed the binary check.
- 2 of 2 passed binary check by having a zero exit code.
- 2 of 2 passed binary check by having the new version present in output.
- found 52.8.1 with grep in /nix/store/4rnqlff4g9vx7ci5b0a6936h9ffk4l8x-spidermonkey-52.8.1
- directory tree listing: https://gist.github.com/75305a95a88a23a3137429c0c5c0007c
- du listing: https://gist.github.com/fe4b93f198ce1088e1e18d002d9cb49a