Upgrade openjdk

[llorllale]

We should upgrade to the newest versions of openjdk.

Openjdk8 is old and is starting to present problems with the CI - see #89

[llorllale]

@0crat assign me

[0crat]

@0crat assign me (here)

@llorllale The job #90 assigned to @llorllale/z, here is why; the budget is 30 minutes, see §4; please, read §8 and §9; if the task is not clear, read this and this; we should be aware that @llorllale/z is on vacation; this ticket may be delayed; there will be no monetary reward for this job

[0crat]

Manual assignment of issues is discouraged, see §19: -5 point(s) just awarded to @llorllale/z

[0crat]

It is strongly discouraged to assign jobs to their creators, see §19: -15 point(s) just awarded to @llorllale/z

[0crat]

Bug was reported, see §29: +15 point(s) just awarded to @llorllale/z

[llorllale]

@0crat wait

[0crat]

@0crat wait (here)

@llorllale The impediment for #90 was registered successfully by @llorllale/z

[victornoel]

@llorllale I would recommend moving to Java 11 as it is the latest LTS.

[llorllale]

@victornoel there are problems with the toolchain (eg. qulice)

[0crat]

The architect of the project has changed; @llorllale/z is not at this role anymore; @paulodamaso/z is the architect now

[0crat]

The architect of the project has changed; @paulodamaso/z is not at this role anymore; @victornoel/z is the architect now