fix: profile certificate mismatch

[bahadirgezer]

Notes

• Fix profile certificate mismatch by updating testflight-auto.yml.
• Event state: action=closed, merged=true.
• Net diff: 1 file changed, 100 insertions(+), 100 deletions(-).
• Changed file: .github/workflows/testflight-auto.yml (deterministic signing logic, import adjustments).
• Commits included: 3cb29f8 (tab out), 0f2e8d7 (add deterministic signing to a profile & cert), c65aa29 (bump xcode vars).
• Key logic updates: import datetime as dt, streamlined profile selection, deterministic signing.
• No additional risk identified; CI passes.

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