Bump org.apache.mina:mina-core in the ftpupload group (#20647)

Bumps the ftpupload group with 1 update: [org.apache.mina:mina-core](https://github.com/apache/mina).


Updates `org.apache.mina:mina-core` from 2.2.5 to 2.2.6
- [Commits](https://github.com/apache/mina/compare/2.2.5...2.2.6)

---
updated-dependencies:
- dependency-name: org.apache.mina:mina-core
  dependency-version: 2.2.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: ftpupload
...

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

@@ -34,7 +34,7 @@
     <dependency>
       <groupId>org.apache.mina</groupId>
       <artifactId>mina-core</artifactId>
-      <version>2.2.5</version>
+      <version>2.2.6</version>
       <scope>compile</scope>
     </dependency>
   </dependencies>