chore(deps): update dependency google-auth to v2.43.0

Author: renovate[bot]

requirements_dev.txt

@@ -13,7 +13,7 @@ ruff==0.14.3
 aiohttp==3.13.2
 async-timeout==5.0.1
 google-api-core==2.25.2
-google-auth==2.42.1
+google-auth==2.43.0
 google-cloud-pubsub==2.33.0
 googleapis-common-protos==1.71.0
 grpcio==1.76.0