Bump tini version to latest

Author: chadlwilson

contrib/scripts/bootstrap-via-installer/Dockerfile

@@ -10,7 +10,7 @@ FROM ...
 # See https://docs.gocd.io/current/installation/install/agent/linux.html
 
 # download tini to ensure that an init process exists
-ADD https://github.com/krallin/tini/releases/download/v0.14.0/tini /tini
+ADD https://github.com/krallin/tini/releases/download/v0.19.0/tini /tini
 RUN chmod +x /tini
 ENTRYPOINT ["/tini", "--"]
 

contrib/scripts/bootstrap-without-installed-agent/Dockerfile

@@ -6,7 +6,7 @@ FROM ...
 # yum install java-1.8.0-openjdk-headless git
 
 # download tini to ensure that an init process exists
-ADD https://github.com/krallin/tini/releases/download/v0.14.0/tini /tini
+ADD https://github.com/krallin/tini/releases/download/v0.19.0/tini /tini
 RUN chmod +x /tini
 ENTRYPOINT ["/tini", "--"]