Changes from Version 1.1.2(5) 7/2022 to 1.1.2.1(6) 12/2023

Maintanance: Updated libs. No new features or bugfixes
* android-gradle 4.1.3->8.1.1
* compileSdkVersion 30->34
* ical4j 2.2.6->2.2.7
* commons-codec 1.11-> 1.16.0
* slf4j 1.7.32->2.0.9

Build Goals:
* stay compatible with Android4.0 (api-14)
* remain minimal apk-size (java-8, no Java-11+desugaring-lib)
