Release 5.0.2 with error source fix for some downstream errors (#1980)

This PR fixes error source for 2 errors:
- parsing of invalid json response should be downstream error as we
expect to receive valid json from zabbix
- no host found error should be downstream. We are bumping sdk that
includes that fix
https://github.com/grafana/grafana-plugin-sdk-go/pull/1246.

As you can see - the invalid json parsing is now downstream error
<img width="1498" alt="image"
src="https://github.com/user-attachments/assets/88028dbe-0f73-47aa-8262-5729059ce12f"
/>

pkg/datasource/models.go

@@ -118,13 +118,13 @@ func ReadQuery(query backend.DataQuery) (QueryModel, error) {
 		Interval:      query.Interval,
 	}
 	if err := json.Unmarshal(query.JSON, &model); err != nil {
-		return model, fmt.Errorf("could not read query: %w", err)
+		return model, backend.DownstreamError(fmt.Errorf("could not read query: %w", err))
 	}
 
 	if model.QueryType == "" {
 		queryJSON, err := simplejson.NewJson(query.JSON)
 		if err != nil {
-			return model, fmt.Errorf("could not read query JSON: %w", err)
+			return model, backend.DownstreamError(fmt.Errorf("could not read query JSON: %w", err))
 		}
 
 		queryType, err := queryJSON.Get("queryType").Int64()