fix(deps): update dependency js-yaml to v4

Author: renovate-bot

mock/package-lock.json

@@ -28,7 +28,7 @@
     "errorhandler": "1.5.1",
     "express": "4.17.1",
     "json-schema-ref-parser": "9.0.6",
-    "js-yaml": "3.14.0",
+    "js-yaml": "4.1.0",
     "morgan": "1.10.0",
     "openapi-backend": "3.6.3",
     "source-map-support": "0.5.19",
@@ -37,7 +37,7 @@
   "devDependencies": {
     "@types/errorhandler": "1.5.0",
     "@types/jest": "26.0.23",
-    "@types/js-yaml": "3.12.5",
+    "@types/js-yaml": "4.0.1",
     "@types/json-schema": "7.0.6",
     "@types/morgan": "1.9.2",
     "@types/node": "11.15.53",

mock/package.json

@@ -49,7 +49,7 @@
     "content-type": "1.0.4",
     "debug": "4.2.0",
     "express": "4.17.1",
-    "js-yaml": "3.14.0",
+    "js-yaml": "4.1.0",
     "json-schema-ref-parser": "9.0.6",
     "lodash": "4.17.20",
     "openapi-backend": "3.6.3",
@@ -65,7 +65,7 @@
     "@types/chai": "4.2.14",
     "@types/content-type": "1.1.3",
     "@types/debug": "4.1.5",
-    "@types/js-yaml": "3.12.5",
+    "@types/js-yaml": "4.0.1",
     "@types/json-schema": "7.0.6",
     "@types/lodash.merge": "4.6.6",
     "@types/mocha": "8.0.4",