Revert "Fix JitPack Java version"

This reverts commit df475864

jitpack.yml

@@ -1,6 +1,2 @@
 jdk:
-  - openjdk16
-
-before_install:
-  - sdk install java 16.0.1-adpt
-  - sdk use java 16.0.1-adpt
+  - openjdk16