deps: update gax to v1.57.0 (#198)

Author: renovate-bot

pom.xml

@@ -65,7 +65,7 @@
  <google.core.version>1.93.5</google.core.version>
  <google.api-common.version>1.9.2</google.api-common.version>
  <google.common-protos.version>1.18.0</google.common-protos.version>
- <gax.version>1.56.0</gax.version>
+ <gax.version>1.57.0</gax.version>
  <grpc.version>1.30.0</grpc.version>
  <protobuf.version>3.12.2</protobuf.version>
  <junit.version>4.13</junit.version>