Update egg-s-a--m-p.json

[RaphaelCapone]

Changing to a more legitimate "download center" link with all versioning backup. The current download website is a little bit shady, the more official one being sa-mp.mp which are made by the current maintainers of Open.MP project for GTA San Andreas.

Description

Download URL is changed to a more safe-legitimate source.

Checklist for all submissions

• [X] Have you followed the guidelines in our Contributing document?
• [X] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [X] Have you tested and reviewed your changes with confidence that everything works?
• [x] Did you branch your changes and PR from that branch and not from your master branch?
  • If not, why?: