Skip test that is reported as unreliable

> Unreliable test timings! On an initial run, this test took 352.68ms,
> which exceeded the deadline of 200.00ms, but on a subsequent run it
> took 5.00 ms, which did not. If you expect this sort of variability in
> your test timings, consider turning deadlines off for this test by
> setting deadline=None.

python-astropy.spec

@@ -127,6 +127,7 @@ pytest_args=(
         --deselect astropy/tests/test_logger.py::test_warnings_logging
         --deselect astropy/tests/test_logger.py::test_warnings_logging_with_custom_class
         --deselect astropy/tests/test_logger.py::test_warning_logging_with_io_votable_warning
+        --deselect astropy/time/tests/test_precision.py::test_sidereal_lat_independent
 )
 
 pushd %{buildroot}/%{python3_sitearch}