Updated Renovate workflow cron offset and timeout

[9larsons]

ref https://linear.app/ghost/issue/PLA-48

Why

First day on 0 * * * * surfaced two issues:

1. GitHub Actions dropped every even-hour tick. Since hourly landed, every UTC even hour (00, 02, 04, 06, 08, 10) failed to fire; only odd hours started runs. GH's docs flag the top of every hour as the worst scheduler-delivery window. 17 * * * * puts us off the contended slot.
2. 30m timeout was firing on real work. Most runs hit timeout-minutes: 30 mid-rebase or mid-lockfile-maintenance across the current 29-PR backlog. Raising to 45 lets catch-up cycles finish; can drop back to 30 once the queue steadies.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 66095682-8a6c-4d89-859f-4521502cd312

📥 Commits

Reviewing files that changed from the base of the PR and between 7b7db30 and 963e5e3.

📒 Files selected for processing (1)

• .github/workflows/renovate.yml

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Walkthrough

This PR adjusts the Renovate GitHub Actions workflow configuration in .github/workflows/renovate.yml. It changes the hourly cron trigger from running at minute 0 to minute 17, with updated inline comments reflecting the new timing. Additionally, the job timeout is increased from 30 to 45 minutes to accommodate longer execution time.

Possibly related PRs

• TryGhost/Ghost#28130: Both PRs modify the same Renovate GitHub Actions workflow by adjusting cron schedule and job timeout configuration.
• TryGhost/Ghost#28157: Both PRs modify the Renovate GitHub Actions workflow cron schedule to tune hourly timing behavior.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely summarizes the two main changes: updating the Renovate workflow's cron schedule offset and increasing the timeout.
Description check	✅ Passed	The description is directly related to the changeset, providing clear context for both modifications with specific technical reasoning about GitHub Actions scheduler behavior and workflow timeout issues.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch pla-48-renovate-cron-timeout-tuning

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