deps: update core dependencies (#100)

Author: renovate-bot

pom.xml

@@ -63,11 +63,11 @@
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <github.global.server>github</github.global.server>
  <site.installationModule>google-cloud-pubsub-parent</site.installationModule>
- <google.core.version>1.92.5</google.core.version>
+ <google.core.version>1.93.0</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>1.53.1</gax.version>
- <grpc.version>1.27.1</grpc.version>
+ <gax.version>1.54.0</gax.version>
+ <grpc.version>1.27.2</grpc.version>
  <protobuf.version>3.11.4</protobuf.version>
  <junit.version>4.13</junit.version>
  <easymock.version>4.2</easymock.version>