Fix kitchen_sink tests for Python 3.14.3

[edenhaus]

Breaking change

Proposed change

SSIA, refers to #162263

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• Dependency upgrade
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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (kitchen_sink) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Adjusts the kitchen_sink switch tests to be stable under Python 3.14.3 by ensuring scheduled state updates are fully processed before assertions.

Changes:

• Add await hass.async_block_till_done() after switch service calls in test_turn_on/test_turn_off to flush schedule_update_ha_state() work before checking state.

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