Bump the magik language server to 0.8.3 (#4292)

Bump the magik language server to 0.8.3.

Release: https://github.com/StevenLooman/magik-tools/releases/tag/0.8.3 
Change log: 
https://github.com/StevenLooman/magik-tools/blob/bad8257b75cf8a9a7adf6c139267cebdcff4386d/CHANGES.md?plain=1#L19

Author: sebastiaanspeck

clients/lsp-magik.el

@@ -34,7 +34,7 @@
   :tag "Lsp Magik"
   :package-version '(lsp-mode . "8.0.1"))
 
-(defcustom lsp-magik-version "0.8.2"
+(defcustom lsp-magik-version "0.8.3"
   "Version of LSP server."
   :type `string
   :group `lsp-magik