Change toolbox to use ampjs versin (#6793)

Author: powerivq

package-lock.json

@@ -60,7 +60,7 @@
 	"dependencies": {
 		"@ampproject/toolbox-cache-list": "2.9.0",
 		"@ampproject/toolbox-cors": "2.9.0",
-		"@ampproject/toolbox-optimizer": "2.9.0",
+		"@ampproject/toolbox-optimizer": "https://gitpkg.now.sh/ampproject/amp-toolbox/packages/optimizer?ampjs",
 		"@google-cloud/datastore": "8.5.0",
 		"@iarna/toml": "2.2.5",
 		"busboy": "1.6.0",