[FIX] sentry: Warning when using classes from collections.abc

The following warning is fixed:

    DeprecationWarning: Using or importing the ABCs from 'collections' instead of
    from 'collections.abc' is deprecated since Python 3.3, and in 3.9 it will stop
    working

sentry/__init__.py

@@ -9,7 +9,7 @@ from odoo.tools import config as odoo_config
 from . import const
 from .logutils import LoggerNameFilter, OdooSentryHandler
 
-import collections
+from collections import abc
 
 _logger = logging.getLogger(__name__)
 HAS_RAVEN = True
@@ -53,7 +53,7 @@ def initialize_raven(config, client_cls=None):
     }
     for option in const.get_sentry_options():
         value = config.get("sentry_%s" % option.key, option.default)
-        if isinstance(option.converter, collections.Callable):
+        if isinstance(option.converter, abc.Callable):
             value = option.converter(value)
         options[option.key] = value