build(deps): bump io.reactivex.rxjava3:rxjava from 3.1.6 to 3.1.8 (#438)

Bumps [io.reactivex.rxjava3:rxjava](https://github.com/ReactiveX/RxJava) from 3.1.6 to 3.1.8.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](ReactiveX/RxJava@v3.1.6...v3.1.8)

---
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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

sandbox/build.gradle.kts

@@ -83,7 +83,7 @@ kotlin {
             dependencies {
                 implementation(libs.ktor.client.core.jvm)
                 implementation(libs.kotlinx.coroutines.rx3)
-                implementation("io.reactivex.rxjava3:rxjava:3.1.7")
+                implementation("io.reactivex.rxjava3:rxjava:3.1.8")
 
                 implementation(libs.ktor.client.logging)
                // implementation(libs.logbackClassic)