Update clirr for exposing newStatementFactory in the DatabaseClient interface

Author: sakthivelmanii

google-cloud-spanner/clirr-ignored-differences.xml

@@ -927,5 +927,9 @@
     <className>com/google/cloud/spanner/connection/ConnectionOptions</className>
     <field>VALID_PROPERTIES</field>
   </difference>
-  
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/DatabaseClient</className>
+    <method>com.google.cloud.spanner.Statement$StatementFactory newStatementFactory()</method>
+  </difference>
 </differences>