Version bump to 1.8.4

ext/installfiles/linux/zerotier-containerized/Dockerfile

@@ -7,11 +7,11 @@ FROM debian:buster-slim as builder
 RUN apt-get update && apt-get install -y curl gnupg
 RUN apt-key adv --keyserver ha.pool.sks-keyservers.net --recv-keys 0x1657198823e52a61  && \
     echo "deb http://download.zerotier.com/debian/buster buster main" > /etc/apt/sources.list.d/zerotier.list
-RUN apt-get update && apt-get install -y zerotier-one=1.6.2
+RUN apt-get update && apt-get install -y zerotier-one=1.8.4
 COPY ext/installfiles/linux/zerotier-containerized/main.sh /var/lib/zerotier-one/main.sh
 
 FROM debian:buster-slim
-LABEL version="1.6.3"
+LABEL version="1.8.4"
 LABEL description="Containerized ZeroTier One for use on CoreOS or other Docker-only Linux hosts."
 
 # ZeroTier relies on UDP port 9993