Prepare 2.5 M4 (2021.0.0).

See #1386

Author: christophstrobl

parent/pom.xml

@@ -134,7 +134,7 @@
 		<javax-annotation-api>1.3.2</javax-annotation-api>
 
 		<!-- Used in asciidoc reference documentation -->
-		<releasetrain>2021.0.0-SNAPSHOT</releasetrain>
+		<releasetrain>2021.0.0-M4</releasetrain>
 
 		<!-- To be overridden by individual modules -->
 		<java-module-name/>
@@ -336,7 +336,7 @@
 				<dependency>
 					<groupId>org.springframework.data.build</groupId>
 					<artifactId>spring-data-build-resources</artifactId>
-					<version>2.5.0-SNAPSHOT</version>
+					<version>2.5.0-M4</version>
 					<type>zip</type>
 					<optional>true</optional>
 				</dependency>