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

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

pom.xml

@@ -51,7 +51,7 @@
         <jackson.version>2.17.2</jackson.version>
         <reactive-streams.version>1.0.4</reactive-streams.version>
 
-        <rxjava3.version>3.1.8</rxjava3.version>
+        <rxjava3.version>3.1.9</rxjava3.version>
         <rxjava2.version>2.2.21</rxjava2.version>
         <rxjava1.version>1.3.8</rxjava1.version>
         <reactor-core.version>3.6.8</reactor-core.version>