release: update to 4.2.8

[github-actions]

Update next release to 4.2.8 version.

• Created by https://github.com/fluent/fluent-bit/actions/runs/29004263034
• Auto-generated by create-pull-request: https://github.com/peter-evans/create-pull-request

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 7feaf9c1ae

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[chatgpt-codex-connector]

Keep the Yocto recipe on a published tag

When this next-version bump is merged by the release workflow (staging-release.yaml computes the next patch and runs update_version.sh), PV becomes 4.2.8 while SRCREV still expands to v${PV}. Until the future v4.2.8 tag is created, BitBake fetches that tag from GitHub and fails, so consumers of the recipe from master lose a working latest-stable recipe; leave this recipe at the last published PV or point it at an existing commit.

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