message: relax complex dense test
diff: @@ -389,7 +389,7 @@ TEST_F(Dense, ComputeDotComplexIsEquivalentToRef)
  complex_b->compute_dot(complex_x.get(), result.get());
  dcomplex_b->compute_dot(dcomplex_x.get(), dresult.get());
  - GKO_ASSERT_MTX_NEAR(result, dresult, r<vtype>::value);
  + GKO_ASSERT_MTX_NEAR(result, dresult, r<vtype>::value * 2);
  }
  @@ -406,7 +406,7 @@ TEST_F(Dense, ComputeConjDotComplexIsEquivalentToRef)
  complex_b->compute_conj_dot(complex_x.get(), result.get());
  dcomplex_b->compute_conj_dot(dcomplex_x.get(), dresult.get());
  - GKO_ASSERT_MTX_NEAR(result, dresult, r<vtype>::value);
  + GKO_ASSERT_MTX_NEAR(result, dresult, r<vtype>::value * 2);
  }
  