bump auth version (#3498)

Author: yihanzhen

google-cloud-clients/pom.xml

@@ -157,7 +157,7 @@
     <bom.version>0.55.2-alpha-SNAPSHOT</bom.version><!-- {x-version-update:google-cloud-bom:current} -->
     <api-client.version>1.23.0</api-client.version>
     <gax.version>1.29.0</gax.version>
-    <google.auth.version>0.9.1</google.auth.version>
+    <google.auth.version>0.10.0</google.auth.version>
     <grpc.version>1.13.1</grpc.version>
     <nettyssl.version>2.0.7.Final</nettyssl.version>
     <guava.version>20.0</guava.version>