Bump org.apache.mina:mina-core in /bundles/org.openhab.binding.ftpupload

Bumps [org.apache.mina:mina-core](https://github.com/apache/mina) from 2.2.1 to 2.2.4.
- [Commits](https://github.com/apache/mina/compare/2.2.1...2.2.4)

---
updated-dependencies:
- dependency-name: org.apache.mina:mina-core
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

bundles/org.openhab.binding.ftpupload/pom.xml

@@ -34,7 +34,7 @@
     <dependency>
       <groupId>org.apache.mina</groupId>
       <artifactId>mina-core</artifactId>
-      <version>2.2.1</version>
+      <version>2.2.4</version>
       <scope>compile</scope>
     </dependency>
   </dependencies>