Bump assertj-core from 3.20.2 to 3.23.1

Bumps [assertj-core](https://github.com/assertj/assertj-core) from 3.20.2 to 3.23.1.
- [Release notes](https://github.com/assertj/assertj-core/releases)
- [Commits](assertj/assertj@assertj-core-3.20.2...assertj-core-3.23.1)

---
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>

Author: dependabot[bot]

build.gradle

@@ -36,7 +36,7 @@ dependencies {
     api 'javax.json:javax.json-api:1.1.4'
     testImplementation 'org.glassfish:javax.json:1.1.4'
     testImplementation 'org.junit.jupiter:junit-jupiter-engine'
-    testImplementation 'org.assertj:assertj-core:3.20.2'
+    testImplementation 'org.assertj:assertj-core:3.23.1'
     testImplementation 'org.mockito:mockito-core:3.11.2'
 }