Harmonize reactive-streams version (elastic#119316)

We depend on the `reactive-streams` library in a couple of places. This
commit extracts the version to the top-level `version.properties` file
to make sure we keep these versions in sync.

build-tools-internal/version.properties

@@ -19,6 +19,7 @@ commons_lang3     = 3.9
 google_oauth_client = 1.34.1
 awsv1sdk            = 1.12.270
 awsv2sdk            = 2.28.13
+reactive_streams    = 1.0.4
 
 antlr4            = 4.13.1
 # bouncy castle version for non-fips. fips jars use a different version

modules/repository-azure/build.gradle

@@ -56,7 +56,7 @@ dependencies {
   api "io.projectreactor.netty:reactor-netty-core:${versions.azureReactorNetty}"
   api "io.projectreactor.netty:reactor-netty-http:${versions.azureReactorNetty}"
   api "io.projectreactor:reactor-core:3.4.38"
-  api "org.reactivestreams:reactive-streams:1.0.4"
+  api "org.reactivestreams:reactive-streams:${versions.reactive_streams}"
 
   // Others
   api "com.fasterxml.woodstox:woodstox-core:6.7.0"

x-pack/plugin/inference/build.gradle

@@ -66,8 +66,8 @@ dependencies {
   api "software.amazon.awssdk:checksums-spi:${versions.awsv2sdk}"
   api "software.amazon.awssdk:checksums:${versions.awsv2sdk}"
   api "software.amazon.awssdk:sdk-core:${versions.awsv2sdk}"
-  api "org.reactivestreams:reactive-streams:1.0.4"
-  api "org.reactivestreams:reactive-streams-tck:1.0.4"
+  api "org.reactivestreams:reactive-streams:${versions.reactive_streams}"
+  api "org.reactivestreams:reactive-streams-tck:${versions.reactive_streams}"
   api "software.amazon.awssdk:profiles:${versions.awsv2sdk}"
   api "software.amazon.awssdk:retries:${versions.awsv2sdk}"
   api "software.amazon.awssdk:auth:${versions.awsv2sdk}"