test: increase timeout to prevent flakiness (#1972)

* test: increase timeout to prevent flakiness

* 🦉 Updates from OwlBot post-processor

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: rajatbhatta

README.md

@@ -56,13 +56,13 @@ implementation 'com.google.cloud:google-cloud-spanner'
 If you are using Gradle without BOM, add this to your dependencies:
 
 ```Groovy
-implementation 'com.google.cloud:google-cloud-spanner:6.27.0'
+implementation 'com.google.cloud:google-cloud-spanner:6.28.0'
 ```
 
 If you are using SBT, add this to your dependencies:
 
 ```Scala
-libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.27.0"
+libraryDependencies += "com.google.cloud" % "google-cloud-spanner" % "6.28.0"
 ```
 
 ## Authentication

google-cloud-spanner/src/test/java/com/google/cloud/spanner/DatabaseClientImplTest.java

@@ -1050,7 +1050,7 @@ public void testExecutePartitionedDmlWithException() {
 
   @Test
   public void testPartitionedDmlDoesNotTimeout() {
-    mockSpanner.setExecuteSqlExecutionTime(SimulatedExecutionTime.ofMinimumAndRandomTime(10, 0));
+    mockSpanner.setExecuteSqlExecutionTime(SimulatedExecutionTime.ofMinimumAndRandomTime(20, 0));
     final RetrySettings retrySettings =
         RetrySettings.newBuilder()
             .setInitialRpcTimeout(Duration.ofMillis(1L))