build(deps): bump node from 25.5.0-slim to 25.6.0-slim

Bumps node from 25.5.0-slim to 25.6.0-slim.

---
updated-dependencies:
- dependency-name: node
  dependency-version: 25.6.0-slim
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>