Bump rxjava from 3.1.5 to 3.1.6

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:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -78,7 +78,7 @@
     <properties>
         <mutiny-zero.version>1.0.0</mutiny-zero.version>
         <reactive-streams.version>1.0.4</reactive-streams.version>
-        <rxjava3.version>3.1.5</rxjava3.version>
+        <rxjava3.version>3.1.6</rxjava3.version>
         <reactor-core.version>3.5.2</reactor-core.version>
 
         <microprofile-reactive-streams.version>3.0</microprofile-reactive-streams.version>