upgrade robovm to 2.3.19

[klianc09]

This fixes #34.

Also upgraded the robovm gradle plugin to match the robovm version (2.3.19)
I also upgraded libGDX to the newest version (1.11.0), IDK if that's okay.
I saw in test/lwjgl3/build.gradle there is a comment relating to libGdx versions not sure if that's relevant.

Only thing I did test or verify was:

• execute ./gradlew clean uploadArchives -PLOCAL=true like it says in the readme (builds successfully)
• used my locally build snapshot artifact in my game to verify that the error in Incompatible with RoboVM 2.3.19 #34 no longer shows up (error no longer shows up)

[klianc09]

Alright, now also made sure the test projects build without errors, verifying the gradle commands from the workflow file build successfully

Only needed to remove one dependency from the android test project (natives-armeabi)

Then saw that for some reason two .so files were checked in and were registered as being changed. I added them to the gitignore, because it looks like an oversight to me that they aren't. Feel free to correct me.

[MrStahlfelge]

We should not raise the gdx version when not needed as this makes the lib unusable for this versions (without further gradle hacking). Everything else is fine!

[klianc09]

Alright, should I just add another commit, or clean up the history? I'm not sure, can I just change the history of a pull request, or do I need to make a new one?

[MrStahlfelge]

Just make a new commit, we can squash merge

[klianc09]

alright undid the libgdx version upgrade