Upgrade to Reactor Dysprosium SR3

Closes gh-24349

Author: snicoll

build.gradle

@@ -36,7 +36,7 @@ configure(allprojects) { project ->
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.10.2"
 			mavenBom "io.netty:netty-bom:4.1.44.Final"
-			mavenBom "io.projectreactor:reactor-bom:Dysprosium-BUILD-SNAPSHOT"
+			mavenBom "io.projectreactor:reactor-bom:Dysprosium-SR3"
 			mavenBom "io.rsocket:rsocket-bom:1.0.0-RC5"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.25.v20191220"
 			mavenBom "org.jetbrains.kotlin:kotlin-bom:1.3.61"
@@ -286,7 +286,6 @@ configure(allprojects) { project ->
 		}
 		repositories {
 			mavenCentral()
-			maven { url "https://repo.spring.io/snapshot" }  // Reactor Dysprosium snapshots
 			maven { url "https://repo.spring.io/libs-spring-framework-build" }
 		}
 	}