fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-JSYAML-174129

package.json

@@ -57,7 +57,7 @@
     "js-cookie": "^2.1.3",
     "js-sequence-diagrams": "^1000000.0.6",
     "js-url": "^2.3.0",
-    "js-yaml": "^3.7.0",
+    "js-yaml": "^3.13.1",
     "jsdom-nogyp": "^0.8.3",
     "keymaster": "^1.6.2",
     "list.js": "^1.5.0",