chore: fix clirr failures

Author: olavloite

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

@@ -822,4 +822,16 @@
     <method>java.lang.Object runTransaction(com.google.cloud.spanner.connection.Connection$TransactionCallable)</method>
   </difference>
 
+  <!-- Default sequence kind -->
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/connection/Connection</className>
+    <method>void setDefaultSequenceKind(java.lang.String)</method>
+  </difference>
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/connection/Connection</className>
+    <method>java.lang.String getDefaultSequenceKind()</method>
+  </difference>
+  
 </differences>