fix: restore flyway mysql support

pom.xml

@@ -50,6 +50,10 @@
             <groupId>org.flywaydb</groupId>
             <artifactId>flyway-core</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-mysql</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.baomidou</groupId>
             <artifactId>mybatis-plus-boot-starter</artifactId>