Fix .vscode/settings.json: replace --fast with --fast-only (#3308)

This was changed in golangci-lint 2.0.0:
https://github.com/golangci/golangci-lint/blob/main/CHANGELOG.md#v200

Author: denik

.vscode/settings.json

@@ -5,7 +5,7 @@
     },
     "go.lintTool": "golangci-lint",
     "go.lintFlags": [
-        "--fast"
+        "--fast-only"
     ],
     "go.useLanguageServer": true,
     "gopls": {