noticket: Update YDB Java SDK to 2.3.21

...for better TableClient wrapper of QueryService
and data race fixes.

See: https://github.com/ydb-platform/ydb-java-sdk/blob/master/CHANGELOG.md#2321

Author: nvamelichev

WORKSPACE.bazel

@@ -41,7 +41,7 @@ SNAKEYAML_VERSION = "2.4"
 
 YDB_PROTOAPI_VERSION = "1.8.0"
 
-YDB_SDK_VERSION = "2.3.20"
+YDB_SDK_VERSION = "2.3.21"
 
 maven_install(
     name = "java_contribs_stable",

pom.xml

@@ -109,7 +109,7 @@
         <os-maven-plugin.version>1.7.1</os-maven-plugin.version>
 
         <!-- YDB SDK 2.x -->
-        <ydb-sdk-v2.version>2.3.20</ydb-sdk-v2.version>
+        <ydb-sdk-v2.version>2.3.21</ydb-sdk-v2.version>
         <ydb-proto-api.version>1.8.0</ydb-proto-api.version>
 
         <!-- build-only dependencies (provided) -->