feat: update sdk version

Author: m-pizarro

package.json

@@ -15,7 +15,7 @@
   },
   "bugs": "https://github.com/cloudgraphdev/cli/issues",
   "dependencies": {
-    "@cloudgraph/sdk": "^0.18.1",
+    "@cloudgraph/sdk": "^0.21.0",
     "@graphql-tools/load-files": "^6.3.2",
     "@graphql-tools/merge": "^8.2.0",
     "@oclif/core": "1.6.1",