chore(spanner): lint

Author: harshachinta

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

@@ -1384,7 +1384,7 @@ public void write() throws InterruptedException {
   public void writeAtLeastOnce() throws InterruptedException {
     assumeFalse(
         "Multiplexed session do not throw a SessionNotFound errors. ",
-        spanner.getOptions().getSessionPoolOptions().getUseMultiplexedSession());\
+        spanner.getOptions().getSessionPoolOptions().getUseMultiplexedSession());
     assertThrowsSessionNotFoundIfShouldFail(
         () ->
             client.writeAtLeastOnce(