Bump the java libraries we depend on to their latest versions

Using the magic of Buck's "maven-importer" and the following maven
coordinates:

```
'org.seleniumhq.selenium:htmlunit-driver:jar:2.28.5' \
'junit:junit:jar:4.12' \
'net.bytebuddy:byte-buddy:jar:1.7.9' \
'com.google.code.gson:gson:jar:2.8.2' \
'com.google.guava:guava:jar:23.6-jre' \
'org.apache.commons:commons-exec:jar:1.3' \
'org.eclipse.jetty:jetty-security:jar:9.4.8.v20171121' \
'org.testng:testng:jar:6.13.1' \
'org.pantsbuild:jarjar:jar:1.6.5' \
'org.eclipse.jetty:jetty-util:jar:9.4.8.v20171121' \
'org.eclipse.jetty:jetty-server:jar:9.4.8.v20171121' \
'org.eclipse.jetty:jetty-servlet:jar:9.4.8.v20171121' \
'org.hamcrest:hamcrest-library:jar:1.3' \
'com.github.javaparser:javaparser-core:jar:3.5.7' \
'org.eclipse.jetty:jetty-jmx:jar:9.4.8.v20171121' \
'net.jcip:jcip-annotations:jar:1.0' \
'org.yaml:snakeyaml:jar:1.19' \
'org.mockito:mockito-core:jar:2.13.0' \
'io.netty:netty-all:jar:4.1.19.Final' \
'org.eclipse.mylyn.github:org.eclipse.egit.github.core:jar:2.1.5' \
'org.littleshoot:littleproxy:jar:1.1.2' \
'org.slf4j:slf4j-jdk14:jar:1.7.25'
```

The version of LittleProxy we use is a snapshot and is the old
version from previously with dependencies updated.

Author: shs96c