Bump mysql-connector-java from 8.0.18 to 8.0.21

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 8.0.18 to 8.0.21.
- [Release notes](https://github.com/mysql/mysql-connector-j/releases)
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](mysql/mysql-connector-j@8.0.18...8.0.21)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

samples/mysql-schema/pom.xml

@@ -44,7 +44,7 @@
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>8.0.18</version>
+            <version>8.0.21</version>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>