Update .gitreview with opendev.org

This seems to be needed to be able to put rocky-eol tag on stable/rocky
of tripleo-ipsec.

Change-Id: Ia7efe64b8f61c29fa97c065e4f2b8eb14f5837a7

.gitreview

@@ -1,5 +1,5 @@
 [gerrit]
-host=review.openstack.org
+host=review.opendev.org
 port=29418
 project=openstack/tripleo-ipsec.git
 defaultbranch=stable/rocky