chore(deps): update dependency google-auth to v2.40.3

Author: renovate[bot]

requirements_dev.txt

@@ -13,7 +13,7 @@ ruff==0.11.13
 aiohttp==3.12.13
 async-timeout==5.0.1
 google-api-core==2.25.1
-google-auth==2.29.0
+google-auth==2.40.3
 google-cloud-pubsub==2.30.0
 googleapis-common-protos==1.70.0
 grpcio==1.73.0