Fix DeprecationWarning in TestInterp for unsigned integer dtypes

[vlad-perevezentsev]

This PR suggests update TestInterp::test_left_right_args to avoid DeprecationWarning that occurs when using negative values with unsigned integer dtypes (when DPNP_TEST_ALL_INT_TYPES=1)

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[github-actions]

View rendered docs @ https://intelpython.github.io/dpnp/index.html

[coveralls]

coverage: 71.711%. remained the same
when pulling 3eb85fe on fix_warnings_interp
into 8b4a332 on master.

[github-actions]

Array API standard conformance tests for dpnp=0.18.0dev2=py312he4f9c94_15 ran successfully.
Passed: 1229
Failed: 0
Skipped: 9