Please support java 17

[hmdebenque]

The current master does not build with Java 17.
Will it be possible to have a Java 17 compatible version?

Thanks a lot

[debuglevel]

Even though if it does not compile with Java 17, you should be able to use a JAR which was compiled with an older version.

I include the 239006c commit via jitpack:
https://jitpack.io/#esendex/esendex-java-sdk/239006c634

implementation "com.github.esendex:esendex-java-sdk:239006c634"

On the long run, it's probably safer to switch to a provider which maintains its software.