Bump org.assertj:assertj-core

Bumps the maven group with 1 update in the /gbfs-validator-java directory: [org.assertj:assertj-core](https://github.com/assertj/assertj).


Updates `org.assertj:assertj-core` from 3.27.6 to 3.27.7
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.6...assertj-build-3.27.7)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-version: 3.27.7
  dependency-type: direct:development
  dependency-group: maven
...

Signed-off-by: dependabot[bot] <support@github.com>

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>