IGNITE-12517 Upgrade flink module version to 1.9.1 in ignite-extensions

[Saikat Maitra]

Hi

I have raised a tiny PR to upgrade flink version to latest stable release.

Jira : https://issues.apache.org/jira/browse/IGNITE-12517

PR https://github.com/apache/ignite-extensions/pull/3

Please review and provide approval.

Regards,
Saikat