fix: ui/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-JSYAML-13961110

Author: snyk-bot

ui/package.json

@@ -21,7 +21,7 @@
         "dagre": "^0.8.5",
         "formik": "^2.1.2",
         "history": "^4.7.2",
-        "js-yaml": "^3.13.1",
+        "js-yaml": "^4.1.1",
         "json-merge-patch": "^0.2.3",
         "moment": "^2.24.0",
         "monaco-editor": "0.20.0",