Set proto lower limit.

MarkDaoust · copybara-github · commit 393d7b6fa6aa · 2023-03-17T11:49:21.000-07:00
PiperOrigin-RevId: 517468755
diff --git a/setup.py b/setup.py
@@ -29,7 +29,7 @@
     'absl-py',
     'jinja2',
     'nbformat',
-    'protobuf',
+    'protobuf>=3.12',
     'pyyaml',
 ]
 
