deps: update core dependencies

pom.xml

@@ -66,15 +66,15 @@
     <google.core.version>1.91.1</google.core.version>
     <google.api-common.version>1.8.1</google.api-common.version>
     <google.common-protos.version>1.17.0</google.common-protos.version>
-    <gax.version>1.50.1</gax.version>
-    <grpc.version>1.25.0</grpc.version>
+    <gax.version>1.52.0</gax.version>
+    <grpc.version>1.26.0</grpc.version>
     <protobuf.version>3.11.1</protobuf.version>
     <junit.version>4.12</junit.version>
     <guava.version>28.1-android</guava.version>
     <threeten.version>1.4.0</threeten.version>
     <javax.annotations.version>1.3.2</javax.annotations.version>
     <animal-sniffer.version>1.18</animal-sniffer.version>
-    <google.auth.version>0.18.0</google.auth.version>
+    <google.auth.version>0.19.0</google.auth.version>
   </properties>
 
   <dependencyManagement>
@@ -119,7 +119,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-core-bom</artifactId>
-        <version>1.91.3</version>
+        <version>1.92.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>