update swagger

pom.xml

@@ -181,7 +181,7 @@
             <dependency>
                 <groupId>com.github.xiaoymin</groupId>
                 <artifactId>knife4j-spring-boot-starter</artifactId>
-                <version>2.0.8</version>
+                <version>2.0.9</version>
             </dependency>
             <dependency>
                 <groupId>io.swagger</groupId>