Increase error tolerance in IBilinearMicrokernelTester

Without it, the test spuriously fail once in ~1000 times

PiperOrigin-RevId: 306358680
diff --git a/test/ibilinear-microkernel-tester.h b/test/ibilinear-microkernel-tester.h
index 7ec159d..c043340 100644
--- a/test/ibilinear-microkernel-tester.h
+++ b/test/ibilinear-microkernel-tester.h
@@ -123,7 +123,7 @@
           ASSERT_NEAR(
               output_ref[i * channels() + c],
               output[i * output_stride() + c],
-              std::abs(output_ref[i * channels() + c]) * 1.0e-5)
+              std::abs(output_ref[i * channels() + c]) * 1.0e-4)
             << "i = " << i << ", channel = " << c;
         }
       }