Start building against Reactor Reactor 2020.0.47 snapshots

See gh-33322

build.gradle

@@ -29,7 +29,7 @@ configure(allprojects) { project ->
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.7"
 			mavenBom "io.netty:netty-bom:4.1.111.Final"
-			mavenBom "io.projectreactor:reactor-bom:2020.0.45"
+			mavenBom "io.projectreactor:reactor-bom:2020.0.47-SNAPSHOT"
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR13"
 			mavenBom "io.rsocket:rsocket-bom:1.1.3"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.54.v20240208"
@@ -291,6 +291,7 @@ configure(allprojects) { project ->
 		}
 		repositories {
 			mavenCentral()
+			maven { url "https://repo.spring.io/snapshot" } // reactor
 			maven { url "https://repo.spring.io/libs-spring-framework-build" }
 		}
 	}