[home-assistant/core] Fix issue #177183: Nuki integration lock entity fails to register due to non-string unique_id

Job description

Fix GitHub issue 177183 in home assistant/core: https://github.com/home assistant/core/issues/177183 Repo: https://github.com/home assistant/core Target: Ship a real upstream code fix for the Nuki integration bug where the lock entity fails to register because unique id is not a string. Required deliverables: A real upstream code change against home assistant/core. An upstream pull request linked to issue 177183. Testing notes describing what you validated. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit the upstream patch plus the PR.