Upgrade to Flyway 9.21.2

Closes gh-37076

Author: snicoll

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/flyway/FlywayPropertiesTests.java

@@ -114,6 +114,8 @@ void expectedPropertiesAreManaged() {
 				"oracleWalletLocation", "sqlServerKerberosLoginFile");
 		// Properties that are managed by specific extensions
 		ignoreProperties(properties, "oracle", "postgresql", "sqlserver");
+		// https://github.com/flyway/flyway/issues/3732
+		ignoreProperties(configuration, "environment");
 		// High level object we can't set with properties
 		ignoreProperties(configuration, "callbacks", "classLoader", "dataSource", "javaMigrations",
 				"javaMigrationClassProvider", "pluginRegister", "resourceProvider", "resolvers");

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -283,7 +283,7 @@ bom {
 			]
 		}
 	}
-	library("Flyway", "9.21.1") {
+	library("Flyway", "9.21.2") {
 		group("org.flywaydb") {
 			modules = [
 				"flyway-core",