feat(http-client-python): add mock API tests for reserved operation body param names

[Copilot]

Adds Python SDK mock API test coverage for the SpecialWords_ReservedOperationBodyParams_withItems scenario — verifying that an operation parameter named items (a Python Mapping protocol method) is serialized as "items" on the wire, not mangled to "items_property".

Changes

• package.json: Sets @typespec/http-specs to the stable 0.1.0-alpha.37, which contains the new scenario (aligned with main after a merge)
• mock_api/azure/test_special_words.py + mock_api/unbranded/test_special_words.py: Adds test_reserved_operation_body_params_with_items (sync)
• mock_api/azure/asynctests/test_special_words_async.py + mock_api/unbranded/asynctests/test_special_words_async.py: Adds async counterpart

def test_reserved_operation_body_params_with_items(client: SpecialWordsClient):
    client.reserved_operation_body_params.with_items(items=["item"])

The mock expects POST /special-words/operations/body-param-reserved with body {"items": ["item"]} → 204.

[msyyc]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflicts in package.json and package-lock.json by merging the latest origin/main. Took main's dependency versions (the ~0.82.0 bumps and the stable @typespec/http-specs@0.1.0-alpha.37, which I verified still contains the ReservedOperationBodyParams scenario). The test files and changelog entry are intact, and the resulting diff vs. main is only the 4 new test additions plus the changelog.

[msyyc]

move to #10944