Update setuptools

requirements-dev.txt

@@ -1,6 +1,7 @@
 wheel==0.43.0
 coverage==7.2.7
-setuptools==67.8.0;python_version>="3.12"
+setuptools==71.1.0;python_version>="3.12"
+packaging==23.2;python_versions>="3.12"  # Requirement for setuptools>=71
 
 # Pytest specific deps
 pytest==8.1.1

scripts/ci/install-dev-deps

@@ -27,5 +27,10 @@ def run(command):
 if __name__ == "__main__":
     with cd(REPO_ROOT):
         if sys.version_info[:2] >= (3, 12):
-            run("pip install setuptools")
+            # Python 3.12+ no longer includes setuptools by default.
+
+            # Setuptools 71+ now perfers already installed versions
+            # of packaging _and_ broke the API for packaging<22.0.
+            # We'll pin to match what's in requirements-dev.txt.
+            run("pip install setuptools==71.1.0 packaging==23.2")
         run("pip install -r requirements-dev-lock.txt")