update tomcat version

Author: ukclivecox

docker/seldon-server/Dockerfile

@@ -20,7 +20,7 @@ RUN mkdir -p "$CATALINA_HOME"
 WORKDIR $CATALINA_HOME
 
 ENV TOMCAT_MAJOR 7
-ENV TOMCAT_VERSION 7.0.76
+ENV TOMCAT_VERSION 7.0.77
 ENV TOMCAT_TGZ_URL https://www.apache.org/dist/tomcat/tomcat-$TOMCAT_MAJOR/v$TOMCAT_VERSION/bin/apache-tomcat-$TOMCAT_VERSION.tar.gz
 
 RUN set -x \