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Merge https://github.com/google/adk-python/pull/4833 Syncs version bump and CHANGELOG from release v1.27.1 to main. COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/4833 from google:release/v1.27.1 bc1b50020109004c6797b153a5e9b8144a22aebd PiperOrigin-RevId: 883394436