chore: update agentserver version

[Alex Wang (a1exwang)]

Update agentserver version which the resilient long running and checkpoint feature depends on.

[Copilot]

Pull request overview

Updates the azure-ai-agentserver-* dependency versions used by the langchain_azure_ai hosting integration, aligning the host + converters + tests with the newer request/event/item shapes required for resilient long-running + checkpoint features.

Changes:

• Bump azure-ai-agentserver-core, azure-ai-agentserver-invocations, and azure-ai-agentserver-responses versions in the hosting extra.
• Update ResponsesHostServer request handling to treat CreateResponse as a mapping (using request.get(...)).
• Update converters and unit tests to use dict-style access for events/items and to set required type fields on model payloads.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
libs/azure-ai/tests/unit_tests/agents/hosting/test_stream.py	Adjusts streaming event assertions to use dict-based event payloads (event["type"], event["delta"], etc.).
libs/azure-ai/tests/unit_tests/agents/hosting/test_responses_host.py	Updates request construction and message item shaping to match updated CreateResponse / item schema expectations.
libs/azure-ai/tests/unit_tests/agents/hosting/test_hitl.py	Updates HITL-related test items to include explicit type fields and align with dict-based access patterns.
libs/azure-ai/tests/unit_tests/agents/hosting/test_converters.py	Updates converter tests to include explicit item type fields and align with updated input item shapes.
libs/azure-ai/pyproject.toml	Bumps azure-ai-agentserver-* versions in the hosting optional dependency set.
libs/azure-ai/langchain_azure_ai/agents/hosting/_responses_host.py	Switches request field access from attribute-based (getattr) to mapping-based (request.get).
libs/azure-ai/langchain_azure_ai/agents/hosting/_converters/_request.py	Adds TypeGuards and migrates item/content handling to dict-key access for function calls, outputs, and messages.
libs/azure-ai/langchain_azure_ai/agents/hosting/_converters/_hitl.py	Migrates HITL item handling to dict-key access and stamps emitted MCP approval requests with type="mcp_approval_request".

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