Upgrade to Reactor 2020.0.7

Closes gh-26890

Author: snicoll

build.gradle

@@ -29,7 +29,7 @@ configure(allprojects) { project ->
 		imports {
 			mavenBom "com.fasterxml.jackson:jackson-bom:2.12.3"
 			mavenBom "io.netty:netty-bom:4.1.63.Final"
-			mavenBom "io.projectreactor:reactor-bom:2020.0.7-SNAPSHOT"
+			mavenBom "io.projectreactor:reactor-bom:2020.0.7"
 			mavenBom "io.r2dbc:r2dbc-bom:Arabba-SR9"
 			mavenBom "io.rsocket:rsocket-bom:1.1.0"
 			mavenBom "org.eclipse.jetty:jetty-bom:9.4.40.v20210413"
@@ -290,7 +290,6 @@ configure(allprojects) { project ->
 		repositories {
 			mavenCentral()
 			maven { url "https://repo.spring.io/libs-spring-framework-build" }
-			maven { url "https://repo.spring.io/snapshot" } // Reactor
 		}
 	}
 	configurations.all {