Python: [Bug]: Release validator failed to validate packages

### Description

The release validator failed to validate release 1.16.0: #7924 with the following error:
```
{
"source": "Recovered from the original release-gate output generated before PR #7924 was created.",
"started_at": "2026-08-27T22:01:35.426456+00:00",
"mode": "release",
"base_ref": "upstream/main",
"python_override": null,
"deadline_seconds": 900,
"lockfile": {
"status": "passed",
"duration_seconds": 0.203,
"error": null
},
"failed_aggregate_probes": [
{
"project_path": ".",
"package_name": "agent-framework",
"scenario": "upper",
"resolution": "highest",
"python": "3.11",
"status": "failed",
"duration_seconds": 76.215,
"payload": null,
"error": "\u00d7 No solution found when resolving `--with` dependencies:\n \u2570\u2500\u25b6 Because only azure-ai-agentserver-responses<=2.1.0 is available\n and agent-framework-foundry-hosting==1.0.0b260827 depends on\n azure-ai-agentserver-responses>=2.2.0b1,<3, we can conclude that\n agent-framework-foundry-hosting==1.0.0b260827 cannot be used.\n And because only agent-framework-foundry-hosting==1.0.0b260827 is\n available and you require agent-framework-foundry-hosting, we can\n conclude that your requirements are unsatisfiable."
},
{
"project_path": "packages\\core",
"package_name": "agent-framework-core",
"scenario": "lower",
"resolution": "lowest-direct",
"python": "3.11",
"status": "failed",
"duration_seconds": 86.05,
"payload": null,
"error": "\u00d7 No solution found when resolving `--with` dependencies:\n \u2570\u2500\u25b6 Because only azure-ai-agentserver-responses<=2.1.0 is available\n and agent-framework-foundry-hosting==1.0.0b260827 depends on\n azure-ai-agentserver-responses>=2.2.0b1,<3, we can conclude that\n agent-framework-foundry-hosting==1.0.0b260827 cannot be used.\n And because only agent-framework-foundry-hosting==1.0.0b260827 is\n available and you require agent-framework-foundry-hosting, we can\n conclude that your requirements are unsatisfiable."
}
],
"summary": {
"probes_total": 18,
"probes_passed": 16,
"probes_failed": 2
},
"updated_at": "2026-08-27T22:07:22.610760+00:00"
}
```
`azure-ai-agentserver-responses==2.2.0b1` is already available: https://pypi.org/project/azure-ai-agentserver-responses/2.2.0b1/

### Code Sample

```markdown

```

### Error Messages / Stack Traces

```markdown

```

### Package Versions

agent-framework-core

### Python Version

_No response_

### Additional Context

_No response_