Bump node from 24.18-bookworm to 26.5-bookworm in /workspace

[dependabot]

Bumps node from 24.18-bookworm to 26.5-bookworm.

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[vicotrbb]

Closing because Node 26 is still the Current release line; its official schedule does not enter LTS until 2026-10-28. Devboxes documents and targets Node 24 LTS, so changing the production workspace image now would trade supported stability for no required fix.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.