Bump org.assertj:assertj-core from 3.25.2 to 3.26.3

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.25.2 to 3.26.3.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.25.2...assertj-build-3.26.3)

---
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.kts

@@ -155,7 +155,7 @@ dependencies {
     testImplementation("org.axonframework:axon-messaging:${properties("axonVersion")}")
     testImplementation("org.axonframework:axon-eventsourcing:${properties("axonVersion")}")
     testImplementation("org.axonframework:axon-configuration:${properties("axonVersion")}")
-    testImplementation("org.assertj:assertj-core:3.25.2")
+    testImplementation("org.assertj:assertj-core:3.26.3")
 }
 
 // Configure project's dependencies