deps: update core dependencies

Author: renovate-bot

pom.xml

@@ -63,14 +63,14 @@
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-spanner-parent</site.installationModule>
-    <google.core.version>1.92.0</google.core.version>
+    <google.core.version>1.92.3</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>1.52.0</gax.version>
-    <grpc.version>1.26.0</grpc.version>
+    <gax.version>1.53.1</gax.version>
+    <grpc.version>1.27.0</grpc.version>
     <protobuf.version>3.11.1</protobuf.version>
     <junit.version>4.13</junit.version>
-    <guava.version>28.1-android</guava.version>
+    <guava.version>28.2-android</guava.version>
     <threeten.version>1.4.1</threeten.version>
     <javax.annotations.version>1.3.2</javax.annotations.version>
     <animal-sniffer.version>1.18</animal-sniffer.version>
@@ -146,7 +146,7 @@
       <dependency>
         <groupId>com.google.auth</groupId>
         <artifactId>google-auth-library-bom</artifactId>
-        <version>0.19.0</version>
+        <version>0.20.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>