Remove VaadinWebSecurityConfigurerAdapter

WebSecurityConfigurerAdapter was removed in spring-projects/spring-security#10902

Author: Artur-

vaadin-spring/src/main/java/com/vaadin/flow/spring/SpringSecurityAutoConfiguration.java

@@ -26,7 +26,7 @@
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityCustomizer;
 
 /**
  * Spring boot auto-configuration class for Flow.
@@ -35,7 +35,7 @@
  *
  */
 @Configuration
-@ConditionalOnClass(WebSecurityConfigurerAdapter.class)
+@ConditionalOnClass(WebSecurityCustomizer.class)
 @EnableConfigurationProperties(VaadinConfigurationProperties.class)
 public class SpringSecurityAutoConfiguration {