Update to assertj-core:3.23.1

Closes gh-840

Author: jgrandja

dependencies/spring-authorization-server-dependencies.gradle

@@ -14,7 +14,7 @@ dependencies {
 		api "com.nimbusds:nimbus-jose-jwt:9.23"
 		api "jakarta.servlet:jakarta.servlet-api:5.0.0"
 		api "junit:junit:4.13.2"
-		api "org.assertj:assertj-core:3.22.0"
+		api "org.assertj:assertj-core:3.23.1"
 		api "org.mockito:mockito-core:4.5.1"
 		api "com.squareup.okhttp3:mockwebserver:4.9.3"
 		api "com.squareup.okhttp3:okhttp:4.9.3"