[python] Add PUT test coverage for XML ModelWithDatetime scenario

[Copilot]

The test_model_with_datetime test only covered GET but was missing the PUT operation — the only XML payload test without round-trip coverage. PR #9995 fixed the Spector server to accept both 2022-08-26T18:38:00.000Z and 2022-08-26T18:38:00Z forms, unblocking the PUT test.

• Test changes: Added client.model_with_datetime_value.put(model) to both sync and async test_model_with_datetime tests in generic_mock_api_tests/
• Dependency bump: @typespec/http-specs → 0.1.0-alpha.35-dev.1, @typespec/spec-api → 0.1.0-alpha.14-dev.1 (includes the server-side datetime validation fix)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[python] add test case for #9995
</issue_title>
<issue_description>follow skill https://github.com/microsoft/typespec/blob/main/.github/skills/python-sdk-spector-mock-api-tests/SKILL.md to write test case for #9995
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [python] add test case for https://github.com/microsoft/typespec/pull/9995  #10028

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[azure-sdk]

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[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-python@10035

commit: 75db2ce

[github-actions]

All changed packages have been documented.

• ✅ @typespec/http-client-python

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@typespec/http-client-python - internal ✏️

Add PUT test coverage for ModelWithDatetime XML payload scenario and bump @typespec/http-specs/@typespec/spec-api dependencies to include the datetime validation fix from PR #9995.