VOL-2458 Timestamp format has changed from float32 to timestamp.Timestamp

Change-Id: I66e96a810d578ea2cf3bfa861fd43a02ea9cc5b8
diff --git a/requirements.txt b/requirements.txt
index d471718..f7af3a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,4 +18,4 @@
 structlog==19.2.0
 transitions==0.6.4
 txaioetcd==0.3.0
-voltha-protos==3.0.0
+voltha-protos==3.2.3