Raise numerical tolerances for NormalInverseGamma test

PiperOrigin-RevId: 383659009

Author: axch

tensorflow_probability/python/distributions/distribution_properties_test.py

@@ -85,11 +85,13 @@
 
 SLICING_LOGPROB_ATOL = collections.defaultdict(lambda: 1e-5)
 SLICING_LOGPROB_ATOL.update({
+    'NormalInverseGaussian': 3e-4,  # b/193076242
     'Weibull': 3e-5,
 })
 
 SLICING_LOGPROB_RTOL = collections.defaultdict(lambda: 1e-5)
 SLICING_LOGPROB_RTOL.update({
+    'NormalInverseGaussian': 5e-3,  # b/193076242
     'Weibull': 3e-5,
 })