deps: upgrade to bigtable 2.39.2 (#4355)

Change-Id: I62aec52fc810c3ea9a8db49689ddf740bb6f7e6b

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- [ ] Make sure to open an issue as a [bug/issue](https://togithub.com/googleapis/java-bigtable-hbase/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
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Fixes #<issue_number_goes_here> ☕️

If you write sample code, please follow the [samples format](
https://togithub.com/GoogleCloudPlatform/java-docs-samples/blob/main/SAMPLE_FORMAT.md).

pom.xml

@@ -32,7 +32,7 @@ limitations under the License.
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.7.6</version>
+    <version>1.7.7</version>
   </parent>
 
   <licenses>
@@ -55,7 +55,7 @@ limitations under the License.
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
     <!-- core dependency versions -->
-    <bigtable.version>2.38.0</bigtable.version>
+    <bigtable.version>2.39.2</bigtable.version>
     <google-cloud-bigtable-emulator.version>0.175.0</google-cloud-bigtable-emulator.version>
     <bigtable-metrics-api.version>1.29.2</bigtable-metrics-api.version>
     <!-- Optional dep for bigtable-metrics-api used for tests -->