Update SSHD to 1.0-r766258_M5

766258 fixes the 'channel_by_id: 1: bad id: channel free' client
side error that shows up when using control master to share a
single SSH tunnel for multiple command invocations.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/pom.xml b/pom.xml
index d766243..f15149e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -486,7 +486,7 @@
     <dependency>
       <groupId>org.apache.sshd</groupId>
       <artifactId>sshd</artifactId>
-      <version>1.0-r761333_M5</version>
+      <version>1.0-r766258_M5</version>
       <scope>compile</scope>
     </dependency>