fix(n8n): pin runners to 2.42.6 to match n8n

[anatolinicolae]

Summary

On web3, n8nio/runners was on 2.43.3 while ghcr.io/thundersquared/n8n is on 2.42.6. This pins the runners back to 2.42.6 so both images are on the same version.

The digest sha256:b78816…63a7 is the multi-arch index digest of n8nio/runners:2.42.6 from Docker Hub. It's the same kind of digest Renovate pins: Docker Hub's digest for 2.43.3 matches the one previously pinned.

Notes

• Renovate will offer runners 2.43.3 again. That's a minor bump, so it won't automerge. Once chore(renovate): group n8n and runners image updates in one PR #528 is merged, it arrives grouped with the n8n bump instead.
• yamllint passes.

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Reviewing files that changed from the base of the PR and between 3ac744e and 48ae79c.

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• web3/containers/n8n/docker-compose.yml

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