fix issue reported by component governance (#17678)

* update json-schema version

* remove unused packages

* update package.json

extensions/machine-learning/package.json

@@ -23,12 +23,12 @@
     "type": "git",
     "url": "https://github.com/Microsoft/azuredatastudio.git"
   },
-	"capabilities": {
+  "capabilities": {
     "virtualWorkspaces": false,
     "untrustedWorkspaces": {
       "supported": true
     }
-	},
+  },
   "extensionDependencies": [
     "Microsoft.mssql",
     "Microsoft.notebook"
@@ -156,6 +156,9 @@
     "typemoq": "^2.1.0",
     "vscodetestcover": "^1.1.0"
   },
+  "resolutions": {
+    "json-schema": "0.4.0"
+  },
   "__metadata": {
     "id": "65",
     "publisherDisplayName": "Microsoft",