Update traces_sampler declaration to concrete types (#1091)

Fixes #1090

Author: Ogaday

sentry_sdk/_types.py

@@ -5,7 +5,6 @@
 
 
 if MYPY:
-    from numbers import Real
     from types import TracebackType
     from typing import Any
     from typing import Callable
@@ -32,7 +31,7 @@
     ErrorProcessor = Callable[[Event, ExcInfo], Optional[Event]]
     BreadcrumbProcessor = Callable[[Breadcrumb, BreadcrumbHint], Optional[Breadcrumb]]
 
-    TracesSampler = Callable[[SamplingContext], Union[Real, bool]]
+    TracesSampler = Callable[[SamplingContext], Union[float, int, bool]]
 
     # https://github.com/python/mypy/issues/5710
     NotImplementedType = Any