Upgrade to AssertJ 3.23.1.

Author: jxblum

gradle/dependency-management.gradle

@@ -1,6 +1,6 @@
 // Define dependency version properties
 ext['apacheTaglibsVersion'] = '1.2.5'
-ext['assertjVersion'] = '3.22.0'
+ext['assertjVersion'] = '3.23.1'
 ext['javaxServletApiVersion'] ='4.0.4'
 ext['javaxServletJspJstlApiVersion'] = '1.2.7'
 ext['findbugsVersion'] = "3.0.2"