Bump com.hivemq:hivemq-mqtt-client in /modules/hivemq

Bumps [com.hivemq:hivemq-mqtt-client](https://github.com/hivemq/hivemq-mqtt-client) from 1.3.7 to 1.3.8.
- [Release notes](https://github.com/hivemq/hivemq-mqtt-client/releases)
- [Changelog](https://github.com/hivemq/hivemq-mqtt-client/blob/master/RELEASE.md)
- [Commits](hivemq/hivemq-mqtt-client@v1.3.7...v1.3.8)

---
updated-dependencies:
- dependency-name: com.hivemq:hivemq-mqtt-client
  dependency-version: 1.3.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

modules/hivemq/build.gradle

@@ -15,7 +15,7 @@ dependencies {
     testRuntimeOnly 'org.junit.platform:junit-platform-launcher:1.13.4'
     testImplementation(project(":testcontainers-junit-jupiter"))
     testImplementation("com.hivemq:hivemq-extension-sdk:4.42.0")
-    testImplementation("com.hivemq:hivemq-mqtt-client:1.3.7")
+    testImplementation("com.hivemq:hivemq-mqtt-client:1.3.8")
     testImplementation("org.apache.httpcomponents:httpclient:4.5.14")
     testImplementation("ch.qos.logback:logback-classic:1.5.18")
     testImplementation 'org.assertj:assertj-core:3.27.3'