Merge pull request #485 from linode/renovate-json5

[CI] move to json5, add schedule to run renovate only on weekends

Author: AshleyDumaine

renovate.json renamed to renovate.json5

@@ -3,6 +3,9 @@
   "extends": [
     "config:recommended"
   ],
+  "schedule": [
+    "* * * * 0,6",
+  ],
   "labels": ["dependencies"],
   "postUpdateOptions": ["gomodTidy"],
   "vulnerabilityAlerts": {