Fix update_incident_status command failing on empty API response

[cengugr]

Summary

• Fixed the threatmon_update_incident_status command that was failing with Failed to parse json object from response: b'' error.
• The /incident/status API endpoint returns 200 OK with an empty body on success. The set_status client method was using the default resp_type="json", causing _http_request to fail when parsing the empty response as JSON.
• Changed set_status to use resp_type="response" and updated change_incident_status to check response.ok instead of truthy JSON content.

Changes

• ThreatMon.py: Added resp_type="response" to set_status() method, refactored change_incident_status() to handle raw response
• pack_metadata.json: Version bump 1.0.5 → 1.0.6
• ReleaseNotes/1_0_6.md: Added release note for the fix

Test plan

• Run !threatmon_update_incident_status alarmId="18618355" status="Resolved" in XSOAR and verify it succeeds without JSON parse errors
• Verify error handling works correctly when API returns non-200 status codes (403, 500)
  relates: link to the issue

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