Finish todo after spring boot version upgrade to 2.4.0 (Azure#20188)

Author: Rujun Chen

sdk/spring/azure-spring-boot/src/main/java/com/azure/spring/aad/webapp/AADWebSecurityConfigurerAdapter.java

@@ -19,8 +19,6 @@
 import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;
 import org.springframework.util.StringUtils;
 
-import java.net.URI;
-
 /**
  * Abstract configuration class, used to make AzureClientRegistrationRepository and AuthzCodeGrantRequestEntityConverter
  * take effect.
@@ -60,8 +58,7 @@ protected LogoutSuccessHandler oidcLogoutSuccessHandler() {
             new OidcClientInitiatedLogoutSuccessHandler(this.repo);
         String uri = this.properties.getPostLogoutRedirectUri();
         if (StringUtils.hasText(uri)) {
-            // TODO (jack) Remove deprecated method after we do not need to support spring-boot-2.2.x
-            oidcLogoutSuccessHandler.setPostLogoutRedirectUri(URI.create(uri));
+            oidcLogoutSuccessHandler.setPostLogoutRedirectUri(uri);
         }
         return oidcLogoutSuccessHandler;
     }

sdk/spring/azure-spring-boot/src/main/java/com/azure/spring/aad/webapp/JacksonHttpSessionOAuth2AuthorizedClientRepository.java

@@ -3,14 +3,14 @@
 
 package com.azure.spring.aad.webapp;
 
-import com.azure.spring.aad.webapp.jackson.AADDatabindModule;
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.jackson2.CoreJackson2Module;
 import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
+import org.springframework.security.oauth2.client.jackson2.OAuth2ClientJackson2Module;
 import org.springframework.security.oauth2.client.web.OAuth2AuthorizedClientRepository;
 import org.springframework.util.Assert;
 
@@ -39,9 +39,7 @@ public class JacksonHttpSessionOAuth2AuthorizedClientRepository implements OAuth
 
     public JacksonHttpSessionOAuth2AuthorizedClientRepository() {
         objectMapper = new ObjectMapper();
-        // TODO: Use OAuth2ClientJackson2Module in spring-security
-        // after min spring-security version we need to support >=5.3.0
-        objectMapper.registerModule(new AADDatabindModule());
+        objectMapper.registerModule(new OAuth2ClientJackson2Module());
         objectMapper.registerModule(new CoreJackson2Module());
         objectMapper.registerModule(new JavaTimeModule());
     }