Update dependency org.assertj:assertj-core to v3.26.0 (#255)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -43,4 +43,4 @@ truth = { module = "com.google.truth:truth", version = "1.4.2" }
 junit = "junit:junit:4.13.2"
 mockito = "org.mockito:mockito-core:5.12.0"
 mockitoKotlin = "com.nhaarman.mockitokotlin2:mockito-kotlin:2.2.0"
-assertJ = "org.assertj:assertj-core:3.25.3"
+assertJ = "org.assertj:assertj-core:3.26.0"