chore(deps): bump node from 22-slim to 26-slim

[dependabot]

Bumps node from 22-slim to 26-slim.

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[rmyndharis]

Closing this update for now. Node 26 is still pre-LTS, and the multi-architecture Docker build currently fails because the Puppeteer Chrome executable is not found at the expected path. The runtime upgrade should be handled separately against Node 24 LTS with explicit amd64/arm64 build and browser-launch smoke coverage.

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