nvim: Disable support for Lua rocks in lazy.nvim

Lazy looks for the 'python' command, which doesn't exist on Debian 12.

Ref. folke/lazy.nvim#1548

Author: antoineco

nvim/init.lua

@@ -734,6 +734,9 @@ require "lazy".setup({
   },
   install = {
     colorscheme = { colorscheme }
+  },
+  rocks = {
+    enabled = false
   }
 })