Update tfc-ops to 3.5.4

Dockerfile

@@ -3,7 +3,7 @@ FROM alpine:3
 # Variables set with ARG can be overridden at image build time with
 # "--build-arg var=value".  They are not available in the running container.
 ARG restic_ver=0.16.0
-ARG tfc_ops_ver=3.5.1
+ARG tfc_ops_ver=3.5.4
 ARG tfc_ops_distrib=tfc-ops_${tfc_ops_ver}_Linux_x86_64.tar.gz
 
 # Install Restic, tfc-ops, perl, and jq