build (AssertJ): Bump AssertJ version (vulnerability report: https://github.com/sinch/sinch-sdk-java/security/dependabot/6)

Author: JPPortier

pom.xml

@@ -470,7 +470,7 @@
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
-            <version>3.24.2</version>
+            <version>[3.27.7,)</version>
             <scope>test</scope>
         </dependency>