deps: Update Google Cloud Client Library Dependencies (#6700)

* deps: Update Java client library dependencies

* deps: Update Java client library dependencies

Author: lqiu96

google-cloud-bom/pom.xml

@@ -219,7 +219,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-nio</artifactId>
-        <version>0.127.20</version>
+        <version>0.127.21</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
@@ -245,7 +245,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-spanner-jdbc</artifactId>
-        <version>2.20.1</version>
+        <version>2.20.2</version>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>