Bump reactive-streams from 1.0.3 to 1.0.4 (#142)

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
...

Signed-off-by: dependabot[bot] <[email protected]>

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

build.gradle

@@ -45,7 +45,7 @@ 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:rxjava:1.3.8"
     api "io.reactivex.rxjava3:rxjava:3.1.4"