Update dependency ava to v5.1.0

Dependency update (patch)

Author: renovate[bot]

package-lock.json

@@ -46,7 +46,7 @@
   },
   "homepage": "https://github.com/telemark/node-dsf",
   "devDependencies": {
-    "ava": "5.0.1",
+    "ava": "5.1.0",
     "coveralls": "3.1.1",
     "nyc": "15.1.0",
     "standard": "17.0.0"