Bump rxjava from 3.1.5 to 3.1.6 (#84)

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](ReactiveX/RxJava@v3.1.5...v3.1.6)

---
updated-dependencies:
- dependency-name: io.reactivex.rxjava3:rxjava
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -47,7 +47,7 @@ repositories {
 }
 
 dependencies {
-    implementation "io.reactivex.rxjava3:rxjava:3.1.5"
+    implementation "io.reactivex.rxjava3:rxjava:3.1.6"
     testImplementation "org.reactivestreams:reactive-streams-tck:1.0.3"
     testImplementation "org.testng:testng:7.6.0"
     testImplementation "com.beust:jcommander:1.82"