Suggest Java 17 package installation for openHAB 4

[wborn]

With #215 the openHAB-Linuxpkg build succeeds for OH 4.

Though the packages probably may need some additional updates for OH 4.
E.g. the "suggests" should be updated because Java 17 is required:

openhab-linuxpkg/build.gradle

Line 207 in c612261

suggests('default-jre | java11-runtime | java11-runtime-headless')

[BClark09]

Thanks @wborn, default-jre for most distributions usually points to Java 11 at the moment. So we may need to change it to something like:

suggests('openjdk-17-jdk |  java17-runtime  |  java17-runtime-headless')

I'm assuming openHAB 3 will still get patches? Will need to consider if we should have different branches for the meantime.

[wborn]

Yes more OH 3.4 releases with patches are to be expected.

[BClark09]

Thanks @wborn, I've have made the above pull request.

I've have created a 3.x branch - we should use this in any Jenkins build that patches 3.4.