Relax the recoverable exception matching for concurrent transactions

Make sure to retry as well on exceptions with the following message

```
Caused by: com.amazon.redshift.util.RedshiftException: ERROR: could not complete because of conflict with concurrent transaction
```

Apparently, the previous matching for concurrent transactions exceptions
relied on an exception message that did not end with "concurrent transaction" phrase.

Author: findinpath

plugin/trino-redshift/src/test/java/io/trino/plugin/redshift/TestingRedshiftServer.java

@@ -66,7 +66,7 @@ public static <T, E extends Exception> T executeWithRedshift(HandleCallback<T, E
     public static boolean isExceptionRecoverable(Throwable exception)
     {
         return exception != null && (
-                exception.getMessage().matches(".* concurrent transaction .*")
+                exception.getMessage().matches(".* concurrent transaction.*")
                         || exception.getMessage().matches(".*deadlock detected.*")
                         || exception.getMessage().matches(".*could not open relation with OID.*")
                         || exception.getMessage().matches(".*The connection attempt failed.*"));