Bump assertj-core from 3.19.0 to 3.20.2 (#313)

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.19.0 to 3.20.2.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.19.0...assertj-core-3.20.2)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

pom.xml

@@ -19,7 +19,7 @@
   <properties>
     <annotations.version>21.0.1</annotations.version>
     <assertj-guava.version>3.4.0</assertj-guava.version>
-    <assertj.version>3.19.0</assertj.version>
+    <assertj.version>3.20.2</assertj.version>
     <build-helper-maven-plugin.version>3.2.0</build-helper-maven-plugin.version>
     <checkstyle.config-location>https://raw.githubusercontent.com/gantsign/checkstyle-config/3.4.0/checkstyle.xml</checkstyle.config-location>
     <checkstyle.failsOnError>true</checkstyle.failsOnError>