Upgrade to Spring Data Lovelace-SR21

Closes gh-23775

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -169,7 +169,7 @@
 		<spring-amqp.version>2.1.17.RELEASE</spring-amqp.version>
 		<spring-batch.version>4.1.4.RELEASE</spring-batch.version>
 		<spring-cloud-connectors.version>2.0.7.RELEASE</spring-cloud-connectors.version>
-		<spring-data-releasetrain.version>Lovelace-BUILD-SNAPSHOT</spring-data-releasetrain.version>
+		<spring-data-releasetrain.version>Lovelace-SR21</spring-data-releasetrain.version>
 		<spring-framework.version>${spring.version}</spring-framework.version>
 		<spring-hateoas.version>0.25.2.RELEASE</spring-hateoas.version>
 		<spring-integration.version>5.1.12.RELEASE</spring-integration.version>