Bump testng from 7.5 to 7.6.0 (#68)

Bumps [testng](https://github.com/cbeust/testng) from 7.5 to 7.6.0.
- [Release notes](https://github.com/cbeust/testng/releases)
- [Changelog](https://github.com/cbeust/testng/blob/master/CHANGES.txt)
- [Commits](https://github.com/cbeust/testng/commits)

---
updated-dependencies:
- dependency-name: org.testng:testng
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -49,7 +49,7 @@ repositories {
 dependencies {
     implementation "io.reactivex.rxjava3:rxjava:3.1.5"
     testImplementation "org.reactivestreams:reactive-streams-tck:1.0.3"
-    testImplementation "org.testng:testng:7.5"
+    testImplementation "org.testng:testng:7.6.0"
     testImplementation "com.beust:jcommander:1.82"
 }