chore(language/go): add tool autoupdate option set to false

This is the default setting, but I'm expecting to want to change it soon, so might as well add it to the config.

settings.json

@@ -391,6 +391,7 @@
   "go.testFlags": [
     "-count=1"
   ],
+  "go.toolsManagement.autoUpdate": false,
   "go.useLanguageServer": true,
   "gopls": {
     "formatting.gofumpt": true,