chore(deps): bump assertj-core from 3.20.2 to 3.21.0 (#224)

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] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -55,7 +55,7 @@ dependencies {
 	testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.2'
 	testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.7.2'
 	testImplementation 'org.junit.jupiter:junit-jupiter-params:5.7.0'
-	testImplementation 'org.assertj:assertj-core:3.20.2'
+	testImplementation 'org.assertj:assertj-core:3.21.0'
 	testImplementation 'org.mockito:mockito-core:3.12.4'
 	testImplementation 'io.github.netmikey.logunit:logunit-core:1.1.0'
 	testImplementation 'io.github.netmikey.logunit:logunit-logback:1.1.0'