chore: bump google auth lower bound

PiperOrigin-RevId: 852416081

Author: sasha-gitg

setup.py

@@ -307,7 +307,7 @@
             "google-api-core[grpc] >= 1.34.1,"
             " <3.0.0,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.*,!=2.4.*,!=2.5.*,!=2.6.*,!=2.7.*"
         ),
-        "google-auth >= 2.45.0, <3.0.0",
+        "google-auth >= 2.46.0, <3.0.0",
         "proto-plus >= 1.22.3, <2.0.0",
         "protobuf>=3.20.2,<7.0.0,!=4.21.0,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
         "packaging >= 14.3",