TAXII ingestor ignores `valid_until` property on `Indicator` objects

[r-smith]

Description

The TAXII feed ingestor ignores the valid_until property when ingesting STIX Indicator objects.

Environment

1. OS (where OpenCTI server runs): Ubuntu 24.04
2. OpenCTI version: 6.3.13
3. OpenCTI client: fontend
4. Other environment details:

Reproducible Steps

Steps to create the smallest reproducible scenario:

1. Point the TAXII ingestor to a TAXII server that returns the following sample STIX indicator:

   {
   "objects": [
   {
     "type": "indicator",
     "spec_version": "2.1",
     "id": "indicator--a831dcab-392e-5927-8ed7-9b8c3b343526",
     "indicator_types": [
       "malicious-activity"
     ],
     "pattern": "[ipv4-addr:value = '127.0.0.1']",
     "pattern_type": "stix",
     "created": "2024-11-16T12:12:30.000Z",
     "modified": "2024-11-16T12:12:30.000Z",
     "valid_from": "2024-11-16T12:12:30.000Z",
     "valid_until": "2025-01-16T12:12:30.000Z"
   }
   ]
   }

Expected Output

valid_until should be set to the timestamp specified in the STIX Indicator object.

Actual Output

valid_until is ignored and always set to a fixed 9 months.