[python] Add test cases for float duration encode in query/header params

[Copilot]

PR #9945 fixed the duration encode mock API to use numeric (not string) comparison for float query/header params, so values like 35625.0 correctly match 35625. This PR adds Python test coverage for the 8 scenarios that fix addressed.

Changes

• package.json: Bump @typespec/http-specs 0.1.0-alpha.33-dev.2 → 0.1.0-alpha.33-dev.6 (first version containing the mock API fix)
• 4 test files (azure + unbranded, sync + async): Extend test_query and test_header with the previously untested float milliseconds/larger-unit scenarios:

# Query — whole-number floats that previously failed string comparison
client.query.float_milliseconds(input=35625.0)
client.query.float64_milliseconds(input=35625.0)
client.query.float_seconds_larger_unit(input=150.0)
client.query.float_milliseconds_larger_unit(input=210000.0)

# Header — same, with duration= kwarg
client.header.float_milliseconds(duration=35625.0)
client.header.float64_milliseconds(duration=35625.0)
client.header.float_seconds_larger_unit(duration=150.0)
client.header.float_milliseconds_larger_unit(duration=210000.0)

Original prompt

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This section details on the original issue you should resolve

<issue_title>[python] add test case for #9945
</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 #9945
</issue_description>

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

• Fixes [python] add test case for https://github.com/microsoft/typespec/pull/9945  #9975

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[msyyc]

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