changed numexpr test tolerance to ulp=5 on all platforms #459
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Fixes #458. A test failure was occurring on MacOS Sequoia (version 15) where numpy and numexpr gave slightly different results in
holopy/scattering/tests/test_lens.py::TestLens::test_integrand_prefactor_same_with_numexpr_as_without(). Previously the test looked for exact agreement. This PR allows approximate agreement to within 5 ULPs, which is the range of error expected from accelerated math libraries.