Bump assertj-core from 3.20.2 to 3.21.0

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.20.2 to 3.21.0.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.20.2...assertj-core-3.21.0)

---
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

@@ -46,7 +46,7 @@
         <!--mongodb-driver.version>3.12.7</mongodb-driver.version-->
         <lombok.version>1.18.20</lombok.version>
         <hamcrest.version>1.3</hamcrest.version>
-        <assertj.version>3.20.2</assertj.version>
+        <assertj.version>3.21.0</assertj.version>
         <license.licenseName>mastercard_apache_license</license.licenseName>
         <license.licenseResolver>${project.baseUri}/src/license</license.licenseResolver>
         <license.inceptionYear>2019</license.inceptionYear>