Bump org.assertj:assertj-core (#188)

Author: dependabot[bot]

gbfs-validator-java/pom.xml

@@ -76,7 +76,7 @@
         <argLine />
 
         <!-- Unit test frameworks versions -->
-        <assertj.core.version>3.27.6</assertj.core.version>
+        <assertj.core.version>3.27.7</assertj.core.version>
         <junit.version>6.0.0</junit.version>
         <maven-deploy-plugin.version>3.1.4</maven-deploy-plugin.version>
     </properties>