Update dependencies and used node version

[brot]

The nodejs version used in the Dockerfiles is nodejs 12 which is already EOL (https://endoflife.software/programming-languages/server-side-scripting/nodejs)

The used javascript dependencies could also be updated. e.g docker-hub-api is already deprecated and log4js is outdated

[TheConnMan]

I've upgraded to Node 16. Any help on finding updated dependencies would be greatly appreciated. Thanks!

[brot]

I looked into the used dependencies, but some of them are deprecated and outdated

• docker-hub-api is deprecated and the used version is 4 years old. Did not really find an up-to-date docker-hub API library ☹️
• Not really sure about log4js, but maybe we can use the latest version 6.7.0

I created the PR #43 to upgrade log4js

[TheConnMan]

Yeah, I'm not sure we'll get a replacement for docker-hub-api...