Update dependency js-yaml to v4

Author: renovate[bot]

package-lock.json

@@ -47,7 +47,7 @@
     "@types/dedent": "0.7.2",
     "@types/diff": "4.0.2",
     "@types/jest": "24.9.1",
-    "@types/js-yaml": "3.12.10",
+    "@types/js-yaml": "4.0.9",
     "@types/json-stable-stringify": "1.2.0",
     "@types/lodash": "4.14.192",
     "@types/node": "10.17.60",
@@ -57,7 +57,7 @@
     "istanbul-api": "3.0.0",
     "istanbul-reports": "2.2.7",
     "jest": "24.9.0",
-    "js-yaml": "3.14.2",
+    "js-yaml": "4.1.1",
     "json-stable-stringify": "1.3.0",
     "npm-run-all2": "5.0.2",
     "request": "2.88.2",