Pin protobuf to 3.19.4 for now:

fselmo · fselmo · commit 50c83b902666 · 2022-09-22T12:47:51.000-06:00
- see: protocolbuffers/protobuf#10051 - ``3.19.4`` is the latest non-breaking supported version for python ``3.6`` which is still supported in ``v5```
diff --git a/newsfragments/2659.bugfix.rst b/newsfragments/2659.bugfix.rst
@@ -0,0 +1 @@
+Protobuf dependency breaks at version ``3.20.2`` and above; pin to ``3.19.4`` for now since that is the last non-breaking version for python 3.6.
diff --git a/setup.py b/setup.py
@@ -88,7 +88,7 @@
         "ipfshttpclient==0.8.0a2",
         "jsonschema>=3.2.0,<5",
         "lru-dict>=1.1.6,<2.0.0",
-        "protobuf>=3.10.0,<4",
+        "protobuf==3.19.4",
         "pywin32>=223;platform_system=='Windows'",
         "requests>=2.16.0,<3.0.0",
         # remove typing_extensions after python_requires>=3.8, see web3._utils.compat

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Protobuf dependency breaks at version ``3.20.2`` and above; pin to ``3.19.4`` for now since that is the last non-breaking version for python 3.6.