release: update to 4.1.2

[github-actions]

Update next release to 4.1.2 version.

• Created by https://github.com/fluent/fluent-bit/actions/runs/18361592887
• Auto-generated by create-pull-request: https://github.com/peter-evans/create-pull-request

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