Temporarily disable gradient test for inverse Gaussian while we wait …

…for upstream fix to a regression in SciPy.

PiperOrigin-RevId: 619565585

tensorflow_probability/python/distributions/inverse_gaussian_test.py

@@ -383,6 +383,7 @@ def testInverseGaussianFullyReparameterized(self):
   @test_util.numpy_disable_gradient_test
   def testCompareToExplicitGradient(self):
     """Compare to the explicit reparameterization derivative."""
+    self.skipTest('b/331471078')
     concentration_np = np.arange(4)[..., np.newaxis] + 1.
     concentration = tf.constant(concentration_np, self.dtype)
     loc_np = np.arange(3) + 1.