Fix error when using client-side github provider

[reegnz]

Wrong name used for github.

[reegnz]

When using mason.providers.client I got this error:

[INFO  Wed Nov  2 11:15:47 2022] ...vim/plugged/mason.nvim/lua/mason-core/installer/init.lua:118: Executing installer for Package(name=terraform-ls)
[ERROR Wed Nov  2 11:15:47 2022] ...vim/plugged/mason.nvim/lua/mason-core/providers/init.lua:69: No provider implementation found for github.get_latest_release
[ERROR Wed Nov  2 11:15:47 2022] ...vim/plugged/mason.nvim/lua/mason-core/installer/init.lua:154: Installation failed for Package(name=terraform-ls) error="...vim/plugged/mason.nvim/lua/mason-core/installer/init.lua:121: ...ugged/mason.nvim/lua/mason-core/managers/github/init.lua:55: Failed to fetch latest release from GitHub API. Refer to :h mason-errors-github-api for more information."

Turns out it was a name mismatch, it was looking for github but there was only gh in the client provider config.