Releasing 1.9.1 for VOLTHA-2.9 and updating voltha-protos to 5.1.2

Change-Id: I67698ff9c580315bf56e8d192ed11a44c8685ff8
diff --git a/go.mod b/go.mod
index 9529bfd..4df9412 100644
--- a/go.mod
+++ b/go.mod
@@ -24,13 +24,13 @@
 	github.com/opencord/cordctl v0.0.0-20190909161711-01e9c1f04bf4
 	github.com/opencord/device-management-interface v0.11.0
 	github.com/opencord/omci-lib-go/v2 v2.1.2
-	github.com/opencord/voltha-protos/v5 v5.0.0
+	github.com/opencord/voltha-protos/v5 v5.1.2
 	github.com/pkg/errors v0.8.1 // indirect
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.5.1
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
-	google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0
-	google.golang.org/grpc v1.41.0
+	google.golang.org/genproto v0.0.0-20211207154714-918901c715cf
+	google.golang.org/grpc v1.42.0
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/yaml.v2 v2.3.0
 	gotest.tools v2.2.0+incompatible