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GH-34293: [Java] Error loading native libraries on Windows (#34312)

To fix error on Java native libraries related to `File.separator` on Windows OS: Use `/` to separate path instead of `\`.
* Closes: #34293

Authored-by: david dali susanibar arce <davi.sarces@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>