Add missing v6 version literal

Author: henribru

google-stubs/ads/google_ads/client.pyi

@@ -8,7 +8,8 @@ from google.ads.google_ads.config import _ConfigDataUnparsed
 _V3 = Literal["v3"]
 _V4 = Literal["v4"]
 _V5 = Literal["v5"]
-_V = Union[_V3, _V4, _V5]
+_V6 = Literal["v6"]
+_V = Union[_V3, _V4, _V5, _V6]
 
 class GoogleAdsClient:
     credentials: Credentials = ...

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "google-ads-stubs"
-version = "5.0.0"
+version = "5.0.1"
 license = "Apache-2.0"
 description = "Type stubs for google-ads"
 authors = ["Henrik Bruåsdal <henrik.bruasdal@gmail.com>"]