Fix build matrix generation output

Author: fayazkhan

noxfile.py

@@ -34,6 +34,7 @@
         $ uv run noxfile.py -s dev -P 3.X
 """
 from itertools import groupby
+import sys
 
 import nox
 from packaging.requirements import Requirement
@@ -60,9 +61,9 @@ def lint(session):
 
 def parametrize_test_versions():
     """Parametrize the session with all supported Python & SQLAlchemy versions."""
-    print("Requesting all SQLAlchemy versions from PyPI...")
+    print("Requesting all SQLAlchemy versions from PyPI...", file=sys.stderr)
     response = requests.get("https://pypi.org/pypi/SQLAlchemy/json")
-    print("Preparing test version candidates...")
+    print("Preparing test version candidates...", file=sys.stderr)
     response.raise_for_status()
     data = response.json()
     all_major_and_minor_sqlalchemy_versions = [