Bump couchbase from 4.4.5 to 4.6.0

Bumps [couchbase](https://github.com/couchbase/couchnode) from 4.4.5 to 4.6.0.
- [Release notes](https://github.com/couchbase/couchnode/releases)
- [Commits](couchbase/couchnode@v4.4.5...v4.6.0)

---
updated-dependencies:
- dependency-name: couchbase
  dependency-version: 4.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]