VOL-2458 update to latest pyvoltha for timestamp changes

Change-Id: I55c40fd26bccc65c545379b5e79d5acab983365a
diff --git a/python/requirements.txt b/python/requirements.txt
index d78506e..daf3dd8 100644
--- a/python/requirements.txt
+++ b/python/requirements.txt
@@ -1,2 +1,2 @@
-voltha-protos==3.0.0
-pyvoltha==2.3.12
+voltha-protos==3.2.3
+pyvoltha==2.3.14