chore: Update and rename renovate.json to renovate.json5 (#245)

- json5 allows comments and trailing commas
- allows all PRs to be open instead of a couple 
- updates must be published upstream for 5 days before the PR is opened
(if supported by the renovate manager)

renovate.json

@@ -1,6 +0,0 @@
-{
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:recommended"
-  ]
-}

renovate.json5

@@ -0,0 +1,5 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended", ":disableRateLimiting"],
+  "minimumReleaseAge": "5 days"
+}