Land rapid7#9470, Update docker image dependencies

fix rapid7#8211

Author: firefart

.ruby-version

@@ -1 +1 @@
-2.4.2
+2.4.3

.travis.yml

@@ -12,8 +12,8 @@ addons:
 language: ruby
 rvm:
   - '2.2'
-  - '2.3.5'
-  - '2.4.2'
+  - '2.3.6'
+  - '2.4.3'
 
 env:
   - CMD='bundle exec rake rspec-rerun:spec SPEC_OPTS="--tag content"'

Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.4.2-alpine
+FROM ruby:2.4.3-alpine3.7
 LABEL maintainer="Rapid7"
 
 ARG BUNDLER_ARGS="--jobs=8 --without development test coverage"
@@ -20,14 +20,16 @@ RUN apk update && \
       nmap-scripts \
       nmap-nselibs \
       postgresql-libs \
+      python \
+      python3 \
       ncurses \
       libcap \
     && apk add --virtual .ruby-builddeps \
       autoconf \
       bison \
       build-base \
       ruby-dev \
-      openssl-dev \
+      libressl-dev \
       readline-dev \
       sqlite-dev \
       postgresql-dev \