Update minimal braintree version

We need at least 3.38.0 to manage Dispute and have TooManyRequestsError.

issue11734
review423961003

account.py

@@ -5,10 +5,16 @@ import urllib
 import uuid
 
 import braintree
-from braintree.exceptions import GatewayTimeoutError, TooManyRequestsError
+from braintree.exceptions import TooManyRequestsError
 from braintree.exceptions.braintree_error import BraintreeError
 from sql import Literal
 
+try:
+    from braintree.exceptions import GatewayTimeoutError
+except ImportError:
+    class GatewayTimeoutError(Exception):
+        pass
+
 from trytond.cache import Cache
 from trytond.config import config
 from trytond.i18n import gettext

setup.py

@@ -61,7 +61,7 @@ else:
 if local_version:
     version += '+' + '.'.join(local_version)
 
-requires = ['braintree >= 3.24.0', 'werkzeug']
+requires = ['braintree >= 3.38.0', 'werkzeug']
 for dep in info.get('depends', []):
     if not re.match(r'(ir|res)(\W|$)', dep):
         requires.append(get_require_version('trytond_%s' % dep))