移除 mysql-connector-j；修正 ProcessBuilder 无法直接执行 Windows 上 node 安装的 mmdc

问题；修正因时区问题导致的 Statistics 统计方法不正确的问题

pom.xml

@@ -143,11 +143,6 @@
       <artifactId>lombok</artifactId>
       <optional>true</optional>
     </dependency>
-    <!-- https://mvnrepository.com/artifact/com.mysql/mysql-connector-j -->
-    <dependency>
-      <groupId>com.mysql</groupId>
-      <artifactId>mysql-connector-j</artifactId>
-    </dependency>
 
     <!-- https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc -->
     <dependency>