openapi-types: support x- specification extensions everywhere without a pre-existing index signature (fixes #768)

Author: mitchell-merry

package-lock.json

@@ -43,7 +43,7 @@
     "lerna": "^3.22.1",
     "mocha": "10.2.0",
     "nyc": "15.1.0",
-    "prettier": "^2.0.0",
+    "prettier": "^2.2.0",
     "source-map-support": "0.5.17",
     "supertest": "4.0.1",
     "ts-node": "8.8.2",