chore(deps): bump node from 24-bookworm-slim to 26-bookworm-slim in the docker-images group

[dependabot]

Bumps the docker-images group with 1 update: node.

Updates node from 24-bookworm-slim to 26-bookworm-slim

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[github-actions]

CI triage

CI failed on this PR. Automated classification of the 2 failed job(s):

• Container images / build-and-verify — not baselined: this job did NOT run on the main comparison below (path-scoped skip), so that run says nothing about it either way. Treat the comparison as absent, not green, and inspect the failing step.
• PR required — needs investigation: inspect the failing step and uploaded diagnostics; rerun only after classifying the cause.

Compared with main CI run #13530 (failure). That run's conclusion is an aggregate and did not exercise Container images / build-and-verify.

Classification is evidence routing, not permission to ignore a failure. Exact quarantined Playwright identities remain governed by the flake ledger.

[BigSimmo]

Closing this PR: it bumps the Docker base image to Node 26, but this repo's tooling is pinned to Node >=24.15.0 <25 (engine-strict) across package.json, CI, and the local setup scripts. CI confirmed the incompatibility directly — the container build fails with:

npm error code EBADENGINE ... Required: {"node":">=24.15.0 <25"} Actual: {"node":"v26.7.0"}

Moving off Node 24 needs a coordinated change (engines pin, CI runner version, setup scripts) rather than a piecemeal Docker bump, so closing this rather than trying to force it through.

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[dependabot]

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