Upgrade Knot.

Dockerfile

 # hadolint ignore=DL3007
-FROM registry.hub.docker.com/cznic/knot:v3.2.2
+FROM registry.hub.docker.com/cznic/knot:v3.4.4
 # hadolint ignore=DL3008
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \