deps: remove unnecessary MySQL dependency (#943)

Author: elharo

pom.xml

@@ -231,11 +231,6 @@
         <artifactId>mockito-all</artifactId>
         <version>1.10.19</version>
       </dependency>
-      <dependency>
-        <groupId>mysql</groupId>
-        <artifactId>mysql-connector-java</artifactId>
-        <version>8.0.19</version>
-      </dependency>
       <dependency>
         <groupId>com.google.j2objc</groupId>
         <artifactId>j2objc-annotations</artifactId>