Fix CLI unit test on Windows

Author: johnthagen

tests/test_cli.py

@@ -1,12 +1,13 @@
 import subprocess
+import sys
 
 
 def test_main() -> None:
     """Test the main function of the CLI."""
 
     # Run the CLI command
     result = subprocess.run(
-        ["python", "-m", "fact.cli", "5"],
+        [sys.executable, "-m", "fact.cli", "5"],
         capture_output=True,
         text=True,
     )