Bump org.assertj:assertj-core in /modules/toxiproxy

Bumps [org.assertj:assertj-core](https://github.com/assertj/assertj) from 3.27.4 to 3.27.6.
- [Release notes](https://github.com/assertj/assertj/releases)
- [Commits](assertj/assertj@assertj-build-3.27.4...assertj-build-3.27.6)

---
updated-dependencies:
- dependency-name: org.assertj:assertj-core
  dependency-version: 3.27.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

modules/toxiproxy/build.gradle

@@ -5,7 +5,7 @@ dependencies {
     api 'eu.rekawek.toxiproxy:toxiproxy-java:2.1.7'
 
     testImplementation 'redis.clients:jedis:6.1.0'
-    testImplementation 'org.assertj:assertj-core:3.27.4'
+    testImplementation 'org.assertj:assertj-core:3.27.6'
     testImplementation platform('org.junit:junit-bom:5.13.4')
     testImplementation 'org.junit.jupiter:junit-jupiter'
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher'