Merge pull request graphql-java#3689 from graphql-java/dependabot/gradle/io.projectreactor-reactor-core-3.6.9

Bump io.projectreactor:reactor-core from 3.6.8 to 3.6.9

Author: dondonz

build.gradle

@@ -117,7 +117,7 @@ dependencies {
 
     testImplementation 'org.reactivestreams:reactive-streams-tck:' + reactiveStreamsVersion
     testImplementation "io.reactivex.rxjava2:rxjava:2.2.21"
-    testImplementation "io.projectreactor:reactor-core:3.6.8"
+    testImplementation "io.projectreactor:reactor-core:3.6.9"
 
     testImplementation 'org.testng:testng:7.10.2' // use for reactive streams test inheritance