deps: update core dependencies (#55)

* deps: update core dependencies

* deps: use protobuf-bom

Co-authored-by: Jeff Ching <chingor@google.com>

pom.xml

@@ -63,13 +63,13 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-translate-parent</site.installationModule>
-    <google.core.version>1.91.3</google.core.version>
+    <google.core.version>1.92.0</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>
     <google.auth.version>0.19.0</google.auth.version>
     <google.http-client.version>1.34.0</google.http-client.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>
     <easymock.version>3.6</easymock.version>
@@ -150,12 +150,14 @@
         <type>pom</type>
         <scope>import</scope>
       </dependency>
-
       <dependency>
         <groupId>com.google.protobuf</groupId>
-        <artifactId>protobuf-java</artifactId>
+        <artifactId>protobuf-bom</artifactId>
         <version>${protobuf.version}</version>
+        <type>pom</type>
+        <scope>import</scope>
       </dependency>
+
       <dependency>
         <groupId>com.google.api</groupId>
         <artifactId>api-common</artifactId>