chore: bump engine version and binary version (#87)

Author: chriswk

java-engine/gradle.properties

@@ -1,5 +1,5 @@
 group=io.getunleash
-yggdrasilCoreVersion=0.18.3
-version=0.4.5
+yggdrasilCoreVersion=0.20.3
+version=0.5.0
 clientSpecificationVersion=5.2.2
 clientSpecificationUrlTemplate=https://github.com/Unleash/client-specification/archive/refs/tags/v%s.zip