Bump checkstyle version up to 10.26.1

[Mmuzaf]

patch by Maxim Muzafarov; reviewd by Dmitry Konstantinov for CASSANDRA-21395

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The Cassandra Jira

[netudima]

I see the checkstyle version also mentioned here: https://github.com/apache/cassandra/blob/trunk/ide/nbproject/project.xml#L11 ...