Update dependency org.assertj:assertj-core to v3.23.1

Author: renovate[bot]

gradle.properties

@@ -27,7 +27,7 @@ VER_SLF4J=[1.6,2.0[
 VER_DURIAN=1.2.0
 VER_JGIT=5.13.1.202206130422-r
 VER_JUNIT=5.9.0
-VER_ASSERTJ=3.15.0
+VER_ASSERTJ=3.23.1
 VER_MOCKITO=3.3.3
 
 # Used for Maven Plugin