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] <support@github.com>

pom.xml

@@ -94,7 +94,7 @@
       <dependency>
         <groupId>io.reactivex.rxjava3</groupId>
         <artifactId>rxjava</artifactId>
-        <version>3.1.8</version>
+        <version>3.1.9</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>