[python] Align response-as-bool mock API coverage with split HeadAsBoolean Spector scenarios

[Copilot]

response-as-bool coverage in http-client-python was tied to the pre-split HeadAsBoolean scenario shape. This updates the test-spec dependency so existing sync/async bool HEAD tests track the new exists / notExists scenario split introduced in Azure specs.

• Spec alignment

  • Bumped @azure-tools/azure-http-specs in packages/http-client-python from 0.1.0-alpha.43 to 0.1.0-alpha.44-dev.5 (the version containing:
    • Azure_ClientGenerator_Core_ResponseAsBool_HeadAsBoolean_exists
    • Azure_ClientGenerator_Core_ResponseAsBool_HeadAsBoolean_notExists)
  • Updated package-lock.json accordingly.

• Release notes

  • Added a Chronus internal change entry for @typespec/http-client-python.

• Scenario intent reflected by existing tests

  assert client.head_as_boolean.exists() is True
  assert client.head_as_boolean.not_exists() is False

• Fixes [python] add test case for https://github.com/Azure/typespec-azure/pull/4981 #11407

[azure-pipelines]

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