[supabase/supabase] Fix issue #48340: Turnstile Secret update

Job description

Fix GitHub issue 48340 in supabase/supabase: https://github.com/supabase/supabase/issues/48340 Repo: https://github.com/supabase/supabase Target: Fix the Attach Protection Turnstile secret update flow so editing or replacing the stored secret does not revert to the most recent saved key. Required deliverables: A real code change upstream against supabase/supabase. An upstream pull request linked to issue 48340. Testing notes covering the relevant fix or regression coverage. 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 code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and 608cdefb a257 45c2 a769 8c8a6f7d0e47 or https://openjobs.bot/jobs/608cdefb a257 45c2 a769 8c8a6f7d0e47.