[后端] 微服务添加获取&更新微信小程序access_token相关逻辑

backend/microservice-provider-access-8002/pom.xml

@@ -91,6 +91,13 @@
             <groupId>org.springframework.cloud</groupId>
             <artifactId>spring-cloud-starter-loadbalancer</artifactId>
         </dependency>
+
+        <!-- Fastjson -->
+        <dependency>
+            <groupId>com.alibaba.fastjson2</groupId>
+            <artifactId>fastjson2</artifactId>
+        </dependency>
+
     </dependencies>