Upgraded Bouncy Castle to 1.70 and upgraded test dependencies (#755)

- Adjusted test classes to work with Apache SSHD 2.8.0
- Upgraded Bouncy Castle from 1.69 to 1.70
- Upgraded Apache SSHD from 2.1.0 to 2.8.0
- Upgraded JUnit from 4.12 to 4.13.2
- Upgraded Mockito from 2.28.2 to 4.2.0
- Upgraded Logback from 1.2.6 to 1.2.9
- Upgraded Apache HTTP Client from 4.5.9 to 4.5.14

src/main/java/net/schmizz/sshj/connection/channel/forwarded/RemotePortForwarder.java

@@ -142,6 +142,10 @@ public class RemotePortForwarder
                 // Listen on all IPv4
                 return true;
             }
+            if ("0.0.0.0".equals(address) && "0:0:0:0:0:0:0:0".equals(channelForward.address)) {
+                // Handle IPv4 requests on IPv6 channel forward
+                return true;
+            }
             return false;
         }