Fix typo

Author: fabapp2

applications/spring-shell/src/test/java/org/springframework/sbm/BootUpgrade_27_30_IntegrationTest.java

@@ -30,7 +30,7 @@
 
 import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
 
-@Disabled("Falky at CI hence disabling it")
+@Disabled("Flaky at CI hence disabling it")
 public class BootUpgrade_27_30_IntegrationTest extends IntegrationTestBaseClass {
 
     @Override