releng: build with target e4.42 by default

[arfio]

What it does

Draft pull request to test CI.

How to test

Follow-ups

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the instructions in this template

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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