Bump org.assertj:assertj-core from 3.25.3 to 3.26.3

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.25.3 to 3.26.3.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.25.3...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] <support@github.com>

build.gradle.kts

@@ -307,7 +307,7 @@ dependencies {
     implementation("it.unimi.dsi:fastutil:8.5.14")
 
     testImplementation("org.junit.jupiter:junit-jupiter:5.10.2")
-    testImplementation("org.assertj:assertj-core:3.25.3")
+    testImplementation("org.assertj:assertj-core:3.26.3")
     testImplementation("io.mockk:mockk:1.13.5")
 
     accuracyReportImplementation("com.optimaize.languagedetector:language-detector:0.6")