chore(deps): update dependency google-auth to v2.38.0 (#583)

Author: renovate-bot

.kokoro/requirements.txt

@@ -260,9 +260,9 @@ google-api-core==2.24.0 \
     # via
     #   google-cloud-core
     #   google-cloud-storage
-google-auth==2.37.0 \
-    --hash=sha256:0054623abf1f9c83492c63d3f47e77f0a544caa3d40b2d98e099a611c2dd5d00 \
-    --hash=sha256:42664f18290a6be591be5329a96fe30184be1a1badb7292a7f686a9659de9ca0
+google-auth==2.38.0 \
+    --hash=sha256:8285113607d3b80a3f1543b75962447ba8a09fe85783432a784fdeef6ac094c4 \
+    --hash=sha256:e7dae6694313f434a2727bf2906f27ad259bae090d7aa896590d86feec3d9d4a
     # via
     #   gcp-releasetool
     #   google-api-core

requirements.txt

@@ -134,9 +134,9 @@ google-api-core[grpc]==2.24.0 \
     # via
     #   google-cloud-core
     #   google-cloud-spanner
-google-auth==2.37.0 \
-    --hash=sha256:0054623abf1f9c83492c63d3f47e77f0a544caa3d40b2d98e099a611c2dd5d00 \
-    --hash=sha256:42664f18290a6be591be5329a96fe30184be1a1badb7292a7f686a9659de9ca0
+google-auth==2.38.0 \
+    --hash=sha256:8285113607d3b80a3f1543b75962447ba8a09fe85783432a784fdeef6ac094c4 \
+    --hash=sha256:e7dae6694313f434a2727bf2906f27ad259bae090d7aa896590d86feec3d9d4a
     # via
     #   google-api-core
     #   google-cloud-core