spidermonkey_52: 52.7.4 -> 52.8.0

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/dd4kmbg04pklv4gs9y8cky5bv69id31v-spidermonkey-52.8.0/bin/js52 passed the binary check.
- /nix/store/dd4kmbg04pklv4gs9y8cky5bv69id31v-spidermonkey-52.8.0/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 52.8.0 with grep in /nix/store/dd4kmbg04pklv4gs9y8cky5bv69id31v-spidermonkey-52.8.0
- directory tree listing: https://gist.github.com/1ec4dfe6196b463eb8174ab1aa82023d
- du listing: https://gist.github.com/a7355483d743c1a8d6fb1271ee57a5c0