`SecurityInsight`: `markingRef` of `ThreatIntelligenceGranularMarkingModel` defined as int32 but get string

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/securityinsights/resource-manager/Microsoft.SecurityInsights/stable/2023-02-01/ThreatIntelligence.json#L769

It's defined as int32 but what we get is string.
response
```
"markingRef": "0",
```

Start at specification/securityinsights/resource-manager/Microsoft.SecurityInsights/stable/2023-02-01/ThreatIntelligence.json around line 769 and inspect the ThreatIntelligenceGranularMarkingModel markingRef definition alongside the reported response. Confirm the wire type and update the specification so the declared type matches the returned value; done when the generated API description represents markingRef correctly.

Written by the indexing model from the issue text.