Bump reactive-streams from 1.0.3 to 1.0.4 (#154)

Bumps [reactive-streams](https://github.com/reactive-streams/reactive-streams) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/reactive-streams/reactive-streams/releases)
- [Changelog](https://github.com/reactive-streams/reactive-streams-jvm/blob/master/RELEASE-NOTES.md)
- [Commits](reactive-streams/reactive-streams-jvm@v1.0.3...v1.0.4)

---
updated-dependencies:
- dependency-name: org.reactivestreams:reactive-streams
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

build.gradle

@@ -34,7 +34,7 @@ repositories {
 dependencies {
     signature 'org.codehaus.mojo.signature:java18:1.0@signature'
 
-    api "org.reactivestreams:reactive-streams:1.0.3"
+    api "org.reactivestreams:reactive-streams:1.0.4"
     api "io.reactivex.rxjava3:rxjava:3.1.4"
 
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'