Update apache sshd to 2.3.0

Also update the following dependencies:

* eddsa to 0.3.0
* mina-core to 2.0.21

Change-Id: I9cfa46458c95adcb2c1ab8cf5cebde28b7971afc

lib/mina/BUILD

@@ -6,6 +6,7 @@ java_library(
     visibility = ["//visibility:public"],
     exports = [
         ":eddsa",
+        "@sshd-common//jar",
         "@sshd-mina//jar",
         "@sshd//jar",
     ],