Update dependencies; explicitly set UTF-8 encoding

[itsTyrion]

Did a quick test, everything seems to work so far.
explicitly set UTF-8 encoding because I was getting an "illegal character" error at the section symbol (§) during build.

The Log4J2 version in HEAD/master is vulnerable to Log4shell btw !!

[itsTyrion]

One more thing:

I spent about an hour turning in circles because I didn't know that the Log4j2 plugin cache (Log4j2Plugins.dat) needs to be merged, I was unable to get it to work without it (aside from the deprecated package= property in log4j2.xml)

For Gradle, there's a transformer in shadow

shadowJar { 
    transform(com.github.jengelman.gradle.plugins.shadow.transformers.Log4j2PluginsCacheFileTransformer)
}

For maven, Apache took over what used to be a 3rd party plugin: https://logging.apache.org/log4j/transform/latest/#log4j-plugin-cache-transformer

Should I add that a hint about it to the README?