Bump rxjava from 3.1.5 to 3.1.6 (#1032)

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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amazon-kinesis-client/pom.xml

@@ -109,7 +109,7 @@
  <dependency>
  <groupId>io.reactivex.rxjava3</groupId>
  <artifactId>rxjava</artifactId>
- <version>3.1.5</version>
+ <version>3.1.6</version>
  </dependency>
 
  <dependency>