Bump atol for vmap Beta log_prob.

PiperOrigin-RevId: 343500115

Author: brianwa84

tensorflow_probability/python/distributions/platform_compatibility_test.py

@@ -119,6 +119,7 @@
 # TODO(b/142827327): Bring tolerance down to 0 for all distributions.
 VECTORIZED_LOGPROB_ATOL = collections.defaultdict(lambda: 1e-6)
 VECTORIZED_LOGPROB_ATOL.update({
+    'Beta': 1e-5,
     'BetaBinomial': 1e-5,
     'CholeskyLKJ': 1e-4,
     'LKJ': 1e-3,