deps: update dependency com.google.api:gax-bom to v1.55.0 (#234)

Author: renovate-bot

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

@@ -73,7 +73,7 @@
   <properties>
     <autovalue.version>1.7</autovalue.version>
     <!-- when updating, make sure to align the versions of transitive deps below -->
-    <gax.version>1.54.0</gax.version>
+    <gax.version>1.55.0</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>