Remove org.flywaydb:flyway-community-db-support from dependency management

`org.flywaydb:flyway-community-db-support` is not provided anymore as part
of the flyway release.

See gh-40073

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

@@ -389,7 +389,6 @@ bom {
 		group("org.flywaydb") {
 			modules = [
 				"flyway-commandline",
-				"flyway-community-db-support",
 				"flyway-core",
 				"flyway-database-db2",
 				"flyway-database-derby",