bugfix mysql >= 8.0, 缓存层移除，EbeanServer 运行 Fail，Unknown system variable query_cache_size error！ (#2264)

threw exception; nested exception is javax.persistence.PersistenceException: java.sql.SQLException: Unknown system variable 'query_cache_size'

canal-admin/pom.xml

@@ -34,7 +34,7 @@
             <dependency>
                 <groupId>mysql</groupId>
                 <artifactId>mysql-connector-java</artifactId>
-                <version>5.1.40</version>
+                <version>8.0.17</version>
             </dependency>
             <dependency>
                 <groupId>com.github.ben-manes.caffeine</groupId>