Bump mysql-connector-java from 5.0.4 to 8.0.28 in /samples/transaction

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 5.0.4 to 8.0.28.
- [Release notes](https://github.com/mysql/mysql-connector-j/releases)
- [Changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES)
- [Commits](https://github.com/mysql/mysql-connector-j/commits/8.0.28)

---
updated-dependencies:
- dependency-name: mysql:mysql-connector-java
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/samples/transaction/pom.xml b/samples/transaction/pom.xml
index f6e50d7..7ea0b4d 100644
--- a/samples/transaction/pom.xml
+++ b/samples/transaction/pom.xml
@@ -68,7 +68,7 @@
 	  <dependency>

 	     <groupId>mysql</groupId>

 	     <artifactId>mysql-connector-java</artifactId>

-	     <version>5.0.4</version>

+	     <version>8.0.28</version>

 	     <scope>compile</scope>

 	  </dependency>