deps: update bigtable.version to v2.12.0 (#3767)

Author: renovate-bot

pom.xml

@@ -56,7 +56,7 @@ limitations under the License.
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
     <!-- core dependency versions -->
-    <bigtable.version>2.11.1</bigtable.version>
+    <bigtable.version>2.12.0</bigtable.version>
     <bigtable-client-core.version>1.27.1</bigtable-client-core.version>
     <grpc-conscrypt.version>2.5.2</grpc-conscrypt.version>
     <!--  keeping at this version to align with hbase-->