Restrict protobuf to 4.* versions (#9630)

Protobuf v5 has breaking changes. Here we are limiting the protobuf dependency to one major version, 4, so that we don't have to patch over handling 2 different major versions of protobuf.
dbt-labs · Feb 29, 2024 · e4fe839 · e4fe839
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diff --git a/.changes/unreleased/Dependencies-20240222-102947.yaml b/.changes/unreleased/Dependencies-20240222-102947.yaml
@@ -0,0 +1,6 @@
+kind: Dependencies
+body: Restrict protobuf to 4.* versions
+time: 2024-02-22T10:29:47.595435-08:00
+custom:
+  Author: QMalcolm
+  PR: "9566"
diff --git a/core/setup.py b/core/setup.py
@@ -79,7 +79,7 @@
         # ----
         # Expect compatibility with all new versions of these packages, so lower bounds only.
         "packaging>20.9",
-        "protobuf>=4.0.0",
+        "protobuf>=4.0.0,<5",
         "pytz>=2015.7",
         "pyyaml>=6.0",
         "daff>=1.3.46",