Let ModifyPostgresEnumTypeChange correctly return the volatile flag

Author: bwaldvogel

src/main/java/de/cronn/liquibase/ext/postgres/ModifyPostgresEnumTypeChange.java

@@ -82,6 +82,12 @@ public String getConfirmationMessage() {
 		return "Modified values of enum type %s".formatted(getName());
 	}
 
+	@Override
+	public boolean generateStatementsVolatile(Database database) {
+		// The generated statements depend on the current database state
+		return true;
+	}
+
 	@Override
 	public SqlStatement[] generateStatements(Database database) {
 		List<SqlStatement> statements = new ArrayList<>();