Upgrade to Reactor Dysprosium-SR7

Closes gh-24892

Author: rstoyanchev

build.gradle

@@ -28,7 +28,7 @@ configure(allprojects) { project ->
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.10.3"
 			mavenBom "io.netty:netty-bom:4.1.49.Final"
-			mavenBom "io.projectreactor:reactor-bom:Dysprosium-BUILD-SNAPSHOT"
+			mavenBom "io.projectreactor:reactor-bom:Dysprosium-SR7"
 			mavenBom "io.rsocket:rsocket-bom:1.0.0-RC7-SNAPSHOT"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.28.v20200408"
 			mavenBom "org.jetbrains.kotlin:kotlin-bom:1.3.72"
@@ -279,7 +279,6 @@ configure(allprojects) { project ->
 		repositories {
 			mavenCentral()
 			maven { url "https://repo.spring.io/libs-spring-framework-build" }
-			maven { url "https://repo.spring.io/snapshot" }
 			maven { url "https://oss.jfrog.org/artifactory/oss-snapshot-local" } // RSocket
 		}
 	}