deps: update core dependencies (#54)

* deps: update core dependencies

* deps: import protobuf-bom

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

pom.xml

@@ -63,18 +63,18 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-logging-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>
-    <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>
     <http-client-bom.version>1.34.0</http-client-bom.version>
   </properties>
 
@@ -138,12 +138,14 @@
         <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>