chore(deps): 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:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -24,7 +24,7 @@ def isCI = Boolean.parseBoolean(System.getenv("CI"))
 ext {
     junitVersion = '5.8.0-RC1'
     commonIoVersion = '1.3.2'
-    assertJVersion = '3.20.2'
+    assertJVersion = '3.21.0'
     jsonPathAssertVersion = '2.6.0'
 }