Update dependency org.assertj:assertj-core to v3.27.6 (#648)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

testing/pom.xml

@@ -11,7 +11,7 @@
   <properties>
     <ws.rs-api.version>3.1.0</ws.rs-api.version>
 
-    <assertj.version>3.27.5</assertj.version>
+    <assertj.version>3.27.6</assertj.version>
     <javassist.version>3.30.2-GA</javassist.version>
     <awaitility.version>4.3.0</awaitility.version>
     <objenesis.version>3.4</objenesis.version>