Change slf4j-simple dependency scope to test (#173)

Libraries should only depend on slf4j-api, not bind a specific logging
implementation. Keep slf4j-simple available for tests only.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: zhansheng.lzs

pom.xml

@@ -99,6 +99,7 @@
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
             <version>2.0.7</version>
+            <scope>test</scope>
         </dependency>
         <!-- dependent by okhttp-->
         <dependency>