Bump rxjava from 3.1.4 to 3.1.5

Bumps [rxjava](https://github.com/ReactiveX/RxJava) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/ReactiveX/RxJava/releases)
- [Commits](https://github.com/ReactiveX/RxJava/compare/v3.1.4...v3.1.5)

---
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>

build.gradle

@@ -4,7 +4,7 @@ buildscript {
     ext {
         kotlin_version = '1.6.21'
         core_version = '1.7.0'
-        rxjava_version = '3.1.4'
+        rxjava_version = '3.1.5'
         rxandroid_version = '3.0.0'
         rxkotlin_version = '3.0.1'
         room_version = '2.4.2'