fix: support google-auth >= 2.46.0 (#433)

Fixes
#422

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: daniel-sanche

setup.py

@@ -20,12 +20,12 @@
 
 TOOL_DEPENDENCIES = "click>=6.0.0"
 
-# TODO(https://github.com/googleapis/google-auth-library-python-oauthlib/issues/422): google-auth 2.42.0
-# introduces a change that isn't compatible with
-# google-auth-oauthlib.
-# Specifically https://github.com/googleapis/google-auth-library-python/commit/36ecb1d65883477d27faf9c2281fc289659b9903
-# which results in the unit tests to fail. Remove the upper bound once the issue is resolved.
-DEPENDENCIES = ("google-auth>=2.15.0,<2.42.0", "requests-oauthlib>=0.7.0")
+DEPENDENCIES = (
+    # Exclude google-auth 2.43.0, 2.44.0, 2.45.0 due to an incompatibility.
+    # See: https://github.com/googleapis/google-auth-library-python-oauthlib/issues/422
+    "google-auth>=2.15.0,<3.0.0,!=2.43.0,!=2.44.0,!=2.45.0",
+    "requests-oauthlib>=0.7.0",
+)
 
 
 with io.open("README.rst", "r") as fh: