Prevent typing-extensions from auto-updating to 5.x

The typing-extensions project announced adherence to semver with 4.0.0, which means, at least in theory, 5.0 might include breaking changes. Rather than risk user packages auto-updating to backwards-incompatible versions, we pin this back to ~=4.0, which is equivalent to >=4.0, <5.
dbt-labs · Oct 26, 2023 · 72e272e · 72e272e
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diff --git a/.changes/unreleased/Dependencies-20231026-161207.yaml b/.changes/unreleased/Dependencies-20231026-161207.yaml
@@ -0,0 +1,6 @@
+kind: Dependencies
+body: Restrict typing dependencies to 4.x
+time: 2023-10-26T16:12:07.392758-07:00
+custom:
+  Author: tlento
+  PR: "200"
diff --git a/pyproject.toml b/pyproject.toml
@@ -28,7 +28,7 @@ dependencies = [
   "click>=7.0,<9.0",
   "python-dateutil~=2.0",
   "importlib_metadata~=6.0",
-  "typing-extensions>=4.4",
+  "typing-extensions~=4.4",
 ]
 
 [build-system]