Bump node from 15.12.0-slim to 16.0.0-slim in /docker (from PR #2344)
Bump node from 15.12.0-slim to 16.0.0-slim in /docker (from PR #2344)

Bumps node from 15.12.0-slim to 16.0.0-slim.

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

mozilla-services/tecken,mozilla-services/tecken,mozilla-services/tecken,mozilla-services/tecken