ci: shift cron off :00 (train 20:07, dependabot 16:07 UTC)

[vreshch]

Summary

• Scheduling rule: no cron may fire at minute :00.
• train.yml: cron 0 20 * * 5 -> 7 20 * * 5
• dependabot.yml: both ecosystems (npm, github-actions) 16:00 -> 16:07 Etc/UTC

Test plan

• npm run verify green in worktree
• npx prettier --check on both edited files green
• YAML parses cleanly (python yaml.safe_load) for both files
• action-validator clean on train.yml
• CI checks green on this PR

[github-actions]

🎉 PR Validation ✅ PASSED

Commit: 3ef0cfdc8832195bfbbf0b986fbd6a8d5f353271
Branch: feature/train-cron-fix

Checks:

• ✅ Dependencies installed
• ✅ Type check passed
• ✅ Linting passed
• ✅ Format check passed
• ✅ Tests passed
• ✅ Build successful

Ready to merge! ✨

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🔗 View workflow run
⏰ Generated at: 2026-08-10T21:11:30.842Z