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MINOR: [DOCS] Update version number in example `pom.xml` for JDBC driver (#45123)

The docs still use version `10.0.0` for the JDBC driver example `pom.xml`.

This PR updates the version number to `18.1.0`.

Authored-by: Jonas Benn <freddie-freeloader@users.noreply.github.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>