Fix JGit SSH module version mismatch and update imports for JGit 6.x compatibility

- Updated jgitSsh from 5.13.3 to 6.6.1 to match core jgit version
- Fixed package imports in PluginSshSessionFactory for JGit 6.x
  - JschConfigSessionFactory moved to org.eclipse.jgit.transport.ssh.jsch
  - OpenSshConfig moved to org.eclipse.jgit.transport.ssh.jsch
- Resolves version mismatch that could cause SSH authentication issues

Author: fdevans

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ junit = "4.13.2"
 rundeckCore = "5.16.0-20251006"
 slf4j = "1.7.36"
 jgit = "6.6.1.202309021850-r"
-jgitSsh = "5.13.3.202401111512-r"
+jgitSsh = "6.6.1.202309021850-r"
 spock = "2.0-groovy-3.0"
 cglib = "3.3.0"
 objenesis = "1.4"

src/main/groovy/com/rundeck/plugin/util/PluginSshSessionFactory.groovy

@@ -4,8 +4,8 @@ import com.jcraft.jsch.JSch
 import com.jcraft.jsch.JSchException
 import com.jcraft.jsch.Session
 import org.eclipse.jgit.api.TransportConfigCallback
-import org.eclipse.jgit.transport.JschConfigSessionFactory
-import org.eclipse.jgit.transport.OpenSshConfig
+import org.eclipse.jgit.transport.ssh.jsch.JschConfigSessionFactory
+import org.eclipse.jgit.transport.ssh.jsch.OpenSshConfig
 import org.eclipse.jgit.transport.SshTransport
 import org.eclipse.jgit.transport.Transport
 import org.eclipse.jgit.util.FS