chore(deps): update dependency google-auth to v2.40.0 (googleapis#656)

Author: renovate-bot

requirements.txt

@@ -134,9 +134,9 @@ google-api-core[grpc]==2.24.2 \
     # via
     #   google-cloud-core
     #   google-cloud-spanner
-google-auth==2.39.0 \
-    --hash=sha256:0150b6711e97fb9f52fe599f55648950cc4540015565d8fbb31be2ad6e1548a2 \
-    --hash=sha256:73222d43cdc35a3aeacbfdcaf73142a97839f10de930550d89ebfe1d0a00cde7
+google-auth==2.40.0 \
+    --hash=sha256:c277cf39f7c192d8540eb6331c08b5a0796e8041af8343ae73dd6b269732ca6c \
+    --hash=sha256:dc3a5078acb1043c3e43685c22d628afe40af8559cf561de388e0c939280fcc8
     # via
     #   google-api-core
     #   google-cloud-core