deps: update core dependencies to v1.57.0 (#156)

Author: renovate-bot

pom.xml

@@ -67,7 +67,7 @@
     <google.api-common.version>1.9.2</google.api-common.version>
     <google.common-protos.version>1.18.0</google.common-protos.version>
     <google.auth.version>0.20.0</google.auth.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>