Build(deps): 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]>

News-Android-App/build.gradle

@@ -177,7 +177,7 @@ dependencies {
     implementation 'io.reactivex.rxjava3:rxandroid:3.0.2'
     // Because RxAndroid releases are few and far between, it is recommended you also
     // explicitly depend on RxJava's latest version for bug fixes and new features.
-    implementation 'io.reactivex.rxjava3:rxjava:3.1.8'
+    implementation 'io.reactivex.rxjava3:rxjava:3.1.9'
     implementation "com.squareup.retrofit2:adapter-rxjava3:$RETROFIT_VERSION"
 
     implementation "com.squareup.retrofit2:retrofit:$RETROFIT_VERSION"