release: update to 5.1.5

[github-actions]

Update next release to 5.1.5 version.

• Created by https://github.com/fluent/fluent-bit/actions/runs/38484715776
• Auto-generated by create-pull-request: https://github.com/peter-evans/create-pull-request

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-16T11:51:24.386755Z	cdaf44d	PR opened

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