Bump assertj-core from 3.22.0 to 3.23.1

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.22.0 to 3.23.1.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.22.0...assertj-core-3.23.1)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -18,7 +18,7 @@
   <properties>
     <annotations.version>23.0.0</annotations.version>
     <assertj-guava.version>3.4.0</assertj-guava.version>
-    <assertj.version>3.22.0</assertj.version>
+    <assertj.version>3.23.1</assertj.version>
     <build-helper-maven-plugin.version>3.3.0</build-helper-maven-plugin.version>
     <checkstyle.config-location>https://raw.githubusercontent.com/gantsign/checkstyle-config/3.6.0/checkstyle.xml</checkstyle.config-location>
     <checkstyle.failsOnError>true</checkstyle.failsOnError>