build(deps-dev): bump io.reactivex.rxjava3:rxjava from 3.1.8 to 3.1.9

Bumps [io.reactivex.rxjava3:rxjava](https://github.com/ReactiveX/RxJava) from 3.1.8 to 3.1.9.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](ReactiveX/RxJava@v3.1.8...v3.1.9)

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

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

pom.xml

@@ -80,7 +80,7 @@
         <jctools-core.version>4.0.5</jctools-core.version>
         <mutiny-zero.version>1.0.0</mutiny-zero.version>
         <reactive-streams.version>1.0.4</reactive-streams.version>
-        <rxjava3.version>3.1.8</rxjava3.version>
+        <rxjava3.version>3.1.9</rxjava3.version>
         <reactor-core.version>3.6.9</reactor-core.version>
 
         <microprofile-reactive-streams.version>3.0</microprofile-reactive-streams.version>