chore(deps): bump com.github.mwiede:jsch in /backend

Bumps [com.github.mwiede:jsch](https://github.com/mwiede/jsch) from 2.27.7 to 2.28.6.
- [Release notes](https://github.com/mwiede/jsch/releases)
- [Changelog](https://github.com/mwiede/jsch/blob/master/ChangeLog)
- [Commits](mwiede/jsch@jsch-2.27.7...jsch-2.28.6)

---
updated-dependencies:
- dependency-name: com.github.mwiede:jsch
  dependency-version: 2.28.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/pom.xml

@@ -305,7 +305,7 @@
         <dependency>
             <groupId>com.github.mwiede</groupId>
             <artifactId>jsch</artifactId>
-            <version>2.27.7</version>
+            <version>2.28.6</version>
         </dependency>
 
         <!-- Lombok -->