Latest spec for test stability fix

Author: gsvarovsky

package-lock.json

@@ -83,7 +83,7 @@
   },
   "dependencies": {
     "@ably/msgpack-js": "^0.4.0",
-    "@m-ld/m-ld-spec": "^0.6.6",
+    "@m-ld/m-ld-spec": "^0.6.7-0",
     "@types/abstract-leveldown": "^5.0.1",
     "@types/detect-node": "^2.0.0",
     "@types/jsonld": "^1.5.2",