nvim/psoxizsh: disable annoying plugin updates notification

we still do the check, so that :Lazy will provide accurate status
information, but prevent the notice popup on startup

nvim/lua/psoxizsh/entrypoint/config.lua

@@ -42,6 +42,7 @@ local defaults = function()
       },
       checker = {
         enabled = true,
+        notify = false,
         concurrency = math.max(vim.uv.available_parallelism() - 2, 2),
         frequency = 60 * 60 * 8, -- 8 hours
       },