deps: update core dependencies

Author: renovate-bot

google-cloud-bigtable-deps-bom/pom.xml

@@ -73,10 +73,10 @@
  <properties>
  <autovalue.version>1.7</autovalue.version>
  <!-- when updating, make sure to align the versions of transitive deps below -->
- <gax.version>1.55.0</gax.version>
+ <gax.version>1.56.0</gax.version>
  <google.api-common.version>1.9.0</google.api-common.version>
  <google.common-protos.version>1.17.0</google.common-protos.version>
- <google.core.version>1.93.3</google.core.version>
+ <google.core.version>1.93.4</google.core.version>
  <google.auth.version>0.20.0</google.auth.version>
  <google-http-client.version>1.34.2</google-http-client.version>
  <!-- make sure to update the grpc version in README -->