Use property for assertj version and remove trailing spaces

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

Author: Copilot

pom.xml

@@ -24,6 +24,7 @@
     <lifecycle-mapping.version>1.0.0</lifecycle-mapping.version>
     <jjwt.version>0.13.0</jjwt.version>
     <okhttp.version>5.3.2</okhttp.version>
+    <assertj.version>3.27.7</assertj.version>
     <!-- Default empty argLine property - required for @{argLine} late replacement -->
     <argLine />
   </properties>
@@ -326,8 +327,8 @@
       <dependency>
         <groupId>org.assertj</groupId>
         <artifactId>assertj-core</artifactId>
-        <version>3.27.7</version>
-      </dependency>      
+        <version>${assertj.version}</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>
   <distributionManagement>