Override assertj-core version to 3.27.7 to fix security vulnerability

Co-authored-by: thomasturrell <1552612+thomasturrell@users.noreply.github.com>

Author: Copilot

pom.xml

@@ -322,6 +322,11 @@
         <groupId>io.jsonwebtoken</groupId>
         <artifactId>jjwt-jackson</artifactId>
         <version>${jjwt.version}</version>
+      </dependency>
+      <dependency>
+        <groupId>org.assertj</groupId>
+        <artifactId>assertj-core</artifactId>
+        <version>3.27.7</version>
       </dependency>      
     </dependencies>
   </dependencyManagement>