Update etcd from v3.4.2 to v3.4.3

* etcd v3.4.3 builds with Go v1.12.12 instead of v1.12.9
and adds a few minor metrics fixes
* https://github.com/etcd-io/etcd/compare/v3.4.2...v3.4.3

bare-metal/fedora-coreos/kubernetes/fcc/controller.yaml

@@ -28,7 +28,7 @@ systemd:
           --network host \
           --volume /var/lib/etcd:/var/lib/etcd:rw,Z \
           --volume /etc/ssl/etcd:/etc/ssl/certs:ro,Z \
-          quay.io/coreos/etcd:v3.4.2
+          quay.io/coreos/etcd:v3.4.3
         ExecStop=/usr/bin/podman stop etcd
         [Install]
         WantedBy=multi-user.target