Updating run results Schema to v5 (#4459)

## What are you changing in this pull request and why?

Updates schema on run results JSON reference to. v5

## Checklist
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website/docs/reference/artifacts/run-results-json.md

@@ -3,7 +3,7 @@ title: "Run results JSON file"
 sidebar_label: "Run results"
 ---
 
-**Current schema**: [`v4`](https://schemas.getdbt.com/dbt/run-results/v4/index.html)
+**Current schema**: [`v5`](https://schemas.getdbt.com/dbt/run-results/v5/index.html)
 
  **Produced by:**
  [`build`](/reference/commands/build)